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 mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


oryzias
A genus of cyprinodontid fish that is an egg layer as opposed to others of the same order which are livebearers. It is used extensively in testing carcinogens. ... (12 Dec 1998) ...

os acromiale
An acromion that is joined to the scapular spine by fibrous rather than by bony union. ... (05 Mar 2000) ...

os basilare
Synonym for basilar bone ... The developmental basilar process of the occipital bone which unites with the condylar portions in about the fourth or fifth year, becoming the basilar part of the occipital bone. ... Synonym: basioccipital bone, os basilare. ... (05 Mar 2000) ...

os breve
Synonym for short bone ... One whose dimensions are approximately equal; it consists of a layer of cortical substance enclosing spongy substance and narrow. ... Compare: long bone. ... Synonym: os breve. ... (05 Mar 2000) ...

os calcis
The heel bone. ... (27 Sep 1997) ...

os capitatum
Synonym for capitate ... Enlarged or swollen at tip, gathered into a mass at apex, as compound stigma, a knoblike stigma terminating a style. ... (09 Oct 1997) ...

os centrale
A small bone occasionally found at the dorsal aspect of the wrist between the scaphoid, capitate, and trapezoid; it is developed as an independent cartilage in early foetal life but usually becomes fused with the scaphoid; it occurs normally in most monkeys. ... Synonym: central bone. ... (05 Mar 2000) ...

os centrale tarsi
Synonym for navicular bone ... A bone of the tarsus on the medial side of the foot articulating with the head of the talus, the three cuneiform bones, and occasionally the cuboid. ... Synonym: os naviculare, central bone of ankle, os centrale tarsi. ... (05 Mar 2000) ...

os coccygis
Synonym for coccyx ... <anatomy> The last bone of the spinal column, sometimes referred to as man's vestigial tail. The last portion of the vertebral column just below the sacrum. ... (27 Sep 1997) ...

os costale
Synonym for rib ... 1. <anatomy> One of the curved bones attached to the vertebral column and supporting the lateral walls of the thorax. ... In man there are twelve ribs on each side, of which the upper seven are directly connected with the sternum by cartilages, and are called sternal, or true, ribs. The remaining five pairs are called astern …

os coxae
Synonym for hip bone ... A large flat bone formed by the fusion of the ilium, ischium, and pubis (in the adult), constituting the lateral half of the pelvis; it articulates with its fellow anteriorly, with the sacrum posteriorly, and with the femur laterally. ... Synonym: os coxae, coxa, coxal bone, innominate bone, os innominatum. ... (05 Mar 2000)
os cuboideum
Synonym for cuboid bone ... The lateral bone of the distal row of the tarsus, articulating with the calcaneus, lateral cuneiform, navicular (occasionally), and fourth and fifth metatarsal bones. ... Synonym: os cuboideum. ... (05 Mar 2000) ...

os cuneiforme intermedium
Synonym for intermediate cuneiform bone ... A bone of the distal row of the tarsus; it articulates with the medial and lateral cuneiform, navicular, and second metatarsal bones. ... Synonym: os cuneiforme intermedium, mesocuneiform, middle cuneiform bone, second cuneiform bone, wedge bone. ... (05 Mar 2000) ...

os cuneiforme laterale
Synonym for lateral cuneiform bone ... A bone of the distal row of the tarsus; it articulates with the intermediate cuneiform, cuboid, navicular, and second, third, and fourth metatarsal bones. ... Synonym: os cuneiforme laterale, third cuneiform bone, wedge bone. ... (05 Mar 2000) ...

os cuneiforme mediale
Synonym for medial cuneiform bone ... The largest of the three cuneiform bones, the medial bone of the distal row of the tarsus, articulating with the intermediate cuneiform, navicular, and first and second metatarsal bones. ... Synonym: os cuneiforme mediale, first cuneiform bone, wedge bone. ... (05 Mar 2000) ...

os ethmoidale
Synonym for ethmoid bone ... An irregularly shaped bone lying between the orbital plates of the frontal and anterior to the sphenoid bone; it consists of two lateral masses of thin plates enclosing air cells, attached above to a perforated horizontal lamina, the cribriform plate, from which descends a median vertical or perpendicular plate in the in …

os femoris
Synonym for femur ... <anatomy> The large bone in the thigh that articulates with the pelvis above and the knee below. ... (27 Sep 1997) ...

os frontale
Synonym for frontal bone ... The large single bone forming the forehead and the upper margin and roof of the orbit on either side; it articulates with the parietal, nasal, ethmoid, maxillary, and zygomatic bones, and with the lesser wings of the sphenoid. ... Synonym: os frontale, coronale. ... (05 Mar 2000) ...

os hamatum
Synonym for hamate bone ... The bone on the medial (ulnar) side of the distal row of the carpus; it articulates with the fourth and fifth metacarpal, triquetral, lunate, and capitate. ... Synonym: os hamatum, hamatum, hooked bone, unciform bone, unciforme, uncinatum. ... (05 Mar 2000) ...

os hyoideum
Synonym for hyoid bone ... <anatomy> A U-shaped bone lying between the mandible and the larynx, suspended from the styloid processes by slender stylohyoid ligaments. ... See: hyoid apparatus. ... Synonym: os hyoideum, lingual bone, tongue bone. ... (05 Mar 2000) ...

os iliacum
An alternate term for ilium. ... (05 Mar 2000) ...

os ilium
Synonym for ilium ... <anatomy> The upper and largest, part of the bony pelvic girdle (iliac wing). The ilium articulates on its inner aspect with the sacrum (sacroiliac joint). ... (27 Sep 1997) ...

os incae
Synonym for os interparietale ... The upper part of the squama of the occipital bone, developed in membrane instead of in cartilage as is the rest of the occipital, and occasionally (especially in ancient Peruvian skulls) existing as a separate bone, separated from the remainder of the occipital by the sutura mendosa. ... Synonym: incarial bone, inte …

os incisivum
The anterior and inner portion of the maxilla, which in the foetus and sometimes in the adult is a separate bone; the incisive suture runs from the incisive canal between the lateral incisor and the canine tooth; according to K. Albrecht, the os incisivum is further divided by a suture between the two incisor teeth on each side into two bones, the …

os innominatum
Synonym for hip bone ... A large flat bone formed by the fusion of the ilium, ischium, and pubis (in the adult), constituting the lateral half of the pelvis; it articulates with its fellow anteriorly, with the sacrum posteriorly, and with the femur laterally. ... Synonym: os coxae, coxa, coxal bone, innominate bone, os innominatum. ... (05 Mar 2000)
os intermaxillare
Synonym for os incisivum ... The anterior and inner portion of the maxilla, which in the foetus and sometimes in the adult is a separate bone; the incisive suture runs from the incisive canal between the lateral incisor and the canine tooth; according to K. Albrecht, the os incisivum is further divided by a suture between the two incisor teeth on ea …

os intermedium
Synonym for lunate bone ... One of the proximal row in the carpus between the scaphoid and triquetral; it articulates with the radius, scaphoid, triquetral, hamate, and capitate. ... Synonym: os lunatum, lunare, os intermedium. ... (05 Mar 2000) ...

os intermetatarseum
A supernumerary bone at the base of the first metatarsal, or between the first and second metatarsal bones, usually fused with one or the other or with the medial cuneiform bone. ... Synonym: intermetatarseum. ... (05 Mar 2000) ...

os interparietale
The upper part of the squama of the occipital bone, developed in membrane instead of in cartilage as is the rest of the occipital, and occasionally (especially in ancient Peruvian skulls) existing as a separate bone, separated from the remainder of the occipital by the sutura mendosa. ... Synonym: incarial bone, interparietal bone, os incae. ... (05 …

os irregulare
Synonym for irregular bone ... One of a group of bones having peculiar or complex forms, e.g., vertebrae, many of the skull bones. ... Synonym: os irregulare. ... (05 Mar 2000) ...

os japonicum
A bipartite or tripartite zygomatic bone, found with greater frequency in the Japanese than in other races. ... (05 Mar 2000) ...

os lacrimale
Synonym for lacrimal bone ... An irregularly rectangular thin plate, forming part of the medial wall of the orbit behind the frontal process of the maxilla; it articulates with the inferior nasal concha, ethmoid, frontal, and maxillary bones. ... Synonym: os lacrimale, os unguis. ... (05 Mar 2000) ...

os longum
Synonym for long bone ... One of the elongated bones of the extremities, consisting of a tubular shaft (diaphysis) and two extremities (epiphyses) usually wider than the shaft; the shaft is composed of compact bone surrounding a central medullary cavity. ... Compare: short bone. ... Synonym: os longum, pipe bone. ... (05 Mar 2000) ...

os lunatum
Synonym for lunate bone ... One of the proximal row in the carpus between the scaphoid and triquetral; it articulates with the radius, scaphoid, triquetral, hamate, and capitate. ... Synonym: os lunatum, lunare, os intermedium. ... (05 Mar 2000) ...

os magnum
Synonym for capitate ... Enlarged or swollen at tip, gathered into a mass at apex, as compound stigma, a knoblike stigma terminating a style. ... (09 Oct 1997) ...

os malare
Synonym for zygomatic bone ... A quadrilateral bone which forms the prominence of the cheek; it articulates with the frontal, sphenoid, temporal, and maxillary bone. ... Synonym: os zygomaticum, cheek bone, jugal bone, mala, malar bone, os malare, yoke bone, zygoma. ... (05 Mar 2000) ...

os metacarpale
Synonym for metacarpal bone ... One of the metacarpal bones, five long bones (numbered I to V, beginning with the bone on the radial or thumb side) forming the skeleton of the metacarpus or palm; they articulate with the bones of the distal row of the carpus and with the five proximal phalanges. ... Synonym: os metacarpale. ... (05 Mar 2000) ...

os metatarsale
Synonym for metatarsal bone ... One of the metatarsal bones; the five long bones numbered I to V beginning with the bone on the medial side forming the skeleton of the anterior portion of the foot, articulating posteriorly with the three cuneiform and the cuboid bones, anteriorly with the five proximal phalanges. ... Synonym: os metatarsale. ... (05 M …

os multangulum majus
Synonym for trapezium ... Origin: NL, fr. Gr. A little table, an irregular four-sided figure, dim. Of a table, for; (see Tetra-) + foot, akin to foot; hence, originally, a table with four feet. See Foot. ... 1. <geometry> A plane figure bounded by four right lines, of which no two are parallel. ... 2. <anatomy> A bone of the carpus at the …

os multangulum minus
Synonym for trapezoid bone ... A bone in the distal row of the carpus; it articulates with the second metacarpal, trapezium, capitate, and scaphoid. ... Synonym: os trapezoideum, lesser multangular bone, os multangulum minus, trapezoid. ... (05 Mar 2000) ...

os nasale
Synonym for nasal bone ... Either of two small elongated rectangular bones that together form the bridge of the nose. ... (12 Dec 1998) ...

os naviculare
Synonym for navicular bone ... A bone of the tarsus on the medial side of the foot articulating with the head of the talus, the three cuneiform bones, and occasionally the cuboid. ... Synonym: os naviculare, central bone of ankle, os centrale tarsi. ... (05 Mar 2000) ...

os naviculare manus
Synonym for scaphoid bone ... The largest bone of the proximal row of the carpus on the lateral (radial) side, articulating with the radius, lunate, capitate, trapezium, and trapezoid. ... Synonym: os scaphoideum, navicular bone of hand, os naviculare manus. ... (05 Mar 2000) ...

os occipitale
Synonym for occipital bone ... The bone forming the rear (and rear bottom) of the skull. ... (12 Dec 1998) ...

os odontoideum
The dens of the axis when anomalously not fused with the body of the axis. ... (05 Mar 2000) ...

os orbiculare
Synonym for lenticular process of incus ... A knob at the tip of the long limb of the incus which articulates with the stapes. ... Synonym: processus lenticularis incudis, lenticular apophysis, lenticular bone, orbicular bone, orbicular process, orbiculare, os orbiculare, os sylvii. ... (05 Mar 2000) ...

os palatinum
Synonym: palatine bone. ... (05 Mar 2000) ...

os parietale
Synonym for parietal bone ... The side bone of the skull. ... (12 Dec 1998) ...

os pisiforme
Synonym for pisiform bone ... A small bone resembling a pea in size and shape, in the proximal row of the carpus, lying on the anterior surface of the triquetral with which alone it articulates; it gives insertion to the tendon of the flexor carpi ulnaris muscle. ... Synonym: os pisiforme, lentiform bone. ... (05 Mar 2000) ...

os planum
Synonym for flat bone ... A type of bone characterised by its thin, flattened shape, such as the scapula or certain of the cranial bones. ... Synonym: os planum. ... (05 Mar 2000) ...

os pneumaticum
Synonym for pneumatic bone ... A bone that is hollow or contains many air cells, such as the mastoid process of the temporal bone. ... Synonym: os pneumaticum, hollow bone. ... (05 Mar 2000) ...

os premaxillare
Synonym for os incisivum ... The anterior and inner portion of the maxilla, which in the foetus and sometimes in the adult is a separate bone; the incisive suture runs from the incisive canal between the lateral incisor and the canine tooth; according to K. Albrecht, the os incisivum is further divided by a suture between the two incisor teeth on ea …

os pterygoideum
Synonym for pterygoid process ... A long process extending downward from the junction of the body and great wing of the sphenoid bone on either side; it is formed of two plates (lateral and medial), united anteriorly but separated below to form the pterygoid notch; the pterygoid fossa is formed by the divergence of these two plates posteriorly. ... S …

os pubis
Synonym for mons pubis ... The prominence caused by a pad of fatty tissue over the symphysis pubis in the female. ... Synonym: os pubis, mons veneris, pubes, pubic bone. ... (05 Mar 2000) ...

os pyramidale
Synonym for triquetral bone ... A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. ... Synonym: os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone, triquetrum. ... (05 Mar 2000) ...

os sacrum
Synonym for sacrum ... <anatomy> The triangular-shaped bone lying between the 5th lumbar vertebra and the coccyx (tailbone). ... It consists of 5 vertebrae fused together and it articulates on each side with the bones of the pelvis (ilium), forming the sacroiliac joints. ... (17 Dec 1997) ...

os scaphoideum
Synonym for scaphoid bone ... The largest bone of the proximal row of the carpus on the lateral (radial) side, articulating with the radius, lunate, capitate, trapezium, and trapezoid. ... Synonym: os scaphoideum, navicular bone of hand, os naviculare manus. ... (05 Mar 2000) ...

os sesamoideum
Synonym for sesamoid bone ... A bone formed in a tendon where it passes over a joint. ... Synonym: os sesamoideum. ... (05 Mar 2000) ...

os sphenoidale
Synonym for sphenoid bone ... A bone of most irregular shape occupying the base of the skull; it is described as consisting of a central portion, or body, and six processes: two greater wings, two lesser wings and two pterygoid processes; it articulates with the occipital, frontal, ethmoid, and vomer, and with the paired temporal, parietal, zygomati …

os subtibiale
An inconstant bone found very rarely in the distal articular end of the tibia. ... (05 Mar 2000) ...

os suprasternale
One of the small ossicles occasionally found in the ligaments of the sternoclavicular articulation. ... Synonym: Breschet's bones, episternal bone, suprasternal bone. ... (05 Mar 2000) ...

os sylvii
Synonym for lenticular process of incus ... A knob at the tip of the long limb of the incus which articulates with the stapes. ... Synonym: processus lenticularis incudis, lenticular apophysis, lenticular bone, orbicular bone, orbicular process, orbiculare, os orbiculare, os sylvii. ... (05 Mar 2000) ...

os temporale
Synonym for temporal bone ... <anatomy> A large irregular bone situated in the base and side of the skull, consisting of three parts, squamous, tympanic and petrous. ... The bones are distinct at birth; the petrous part contains the vestibulocochlear organ; the bone articulates with the sphenoid, parietal, occipital, and zygomatic bones, and by …

os tibiale posterius
Os tibiale posticum, a sesamoid bone in the tendon of the tibialis posterior muscle, occasionally fused with the tuberosity of the navicular. ... Synonym: tibiale posticum. ... (05 Mar 2000) ...

os trapezium
Synonym for trapezium ... Origin: NL, fr. Gr. A little table, an irregular four-sided figure, dim. Of a table, for; (see Tetra-) + foot, akin to foot; hence, originally, a table with four feet. See Foot. ... 1. <geometry> A plane figure bounded by four right lines, of which no two are parallel. ... 2. <anatomy> A bone of the carpus at the …

os trapezoideum
Synonym for trapezoid bone ... A bone in the distal row of the carpus; it articulates with the second metacarpal, trapezium, capitate, and scaphoid. ... Synonym: os trapezoideum, lesser multangular bone, os multangulum minus, trapezoid. ... (05 Mar 2000) ...

os triangulare
Synonym for os trigonum ... An independent ossicle sometimes present in the tarsus; usually it forms part of the talus, constituting the lateral tubercle of the posterior process. ... Synonym: os triangulare, triangular bone. ... (05 Mar 2000) ...

os tribasilare
The single bone resulting from the fusion in infancy of the occipital and temporal bones at the base of the cranial cavity. ... (05 Mar 2000) ...

os trigonum
An independent ossicle sometimes present in the tarsus; usually it forms part of the talus, constituting the lateral tubercle of the posterior process. ... Synonym: os triangulare, triangular bone. ... (05 Mar 2000) ...

os triquetrum
Synonym for triquetral bone ... A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. ... Synonym: os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone, triquetrum. ... (05 Mar 2000) ...

os unguis
Synonym for lacrimal bone ... An irregularly rectangular thin plate, forming part of the medial wall of the orbit behind the frontal process of the maxilla; it articulates with the inferior nasal concha, ethmoid, frontal, and maxillary bones. ... Synonym: os lacrimale, os unguis. ... (05 Mar 2000) ...

os uteri externum
Synonym for external os of uterus ... The vaginal opening of the uterus. ... Synonym: ostium uteri, mouth of the womb, opening of uterus, orificium externum uteri, os uteri externum, ostium uteri externum. ... (05 Mar 2000) ...

os uteri internum
Synonym for isthmus of uterus ... An elongated constriction at the junction of the body and cervix of the uterus. ... Synonym: isthmus uteri, Guyon's isthmus, orificium internum uteri, os uteri internum, ostium uteri internum. ... (05 Mar 2000) ...

os vesalianum
The tuberosity of the fifth metatarsal bone sometimes existing as a separate bone. ... Synonym: vesalianum, Vesalius' bone. ... (05 Mar 2000) ...

os zygomaticum
Synonym for zygomatic bone ... A quadrilateral bone which forms the prominence of the cheek; it articulates with the frontal, sphenoid, temporal, and maxillary bone. ... Synonym: os zygomaticum, cheek bone, jugal bone, mala, malar bone, os malare, yoke bone, zygoma. ... (05 Mar 2000) ...

osazone
The compound formed by certain sugars (e.g., glucose, galactose, fructose) with excess hydrazines, possessing two hydrazones on carbons 1 and 2 instead of only one at C-1, as in the ordinary hydrazone; osazone's formed with phenylhydrazine (phenylosazones) are used to characterise and identify certain sugars. ... Synonym: dihydrazone. ... (05 Mar 200 …

osche-
The scrotum. ... Origin: G. Osche ... (05 Mar 2000) ...

oscheal
Synonym for scrotal ... <anatomy> Pertaining to the scrotum. ... (27 Sep 1997) ...

oscheitis
Inflammation of the scrotum. ... Origin: osche-+ G. -itis, inflammation ... (05 Mar 2000) ...

oschelephantiasis
An enlargement or elephantiasis of the scrotum. ... Origin: osche-+ elephantiasis ... (05 Mar 2000) ...

oscheohydrocele
Scrotal hydrocele. ... Origin: oscheo-+ G. Hydor, water, + kele, tumour ... (05 Mar 2000) ...

oscheoplasty
Synonym: scrotoplasty. ... Origin: oscheo-+ plastos, formed ... (05 Mar 2000) ...

oscillate
1. To move backward and forward; to vibrate like a pendulum; to swing; to sway. ... 2. To vary or fluctuate between fixed limits; to act or move in a fickle or fluctuating manner; to change repeatedly, back and forth. 'The amount of superior families oscillates rather than changes, that is, it fluctuates within fixed limits.' (Dc Quincey) ... Origin: …

oscillating vision
Synonym for oscillopsia ... The subjective sensation of oscillation of objects viewed. ... Synonym: oscillating vision. ... Origin: L. Oscillo, to swing, + G. Opsis, vision ... (05 Mar 2000) ...

oscillation
1. The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration. ... 2. Fluctuation; variation; change back and forth. 'His mind oscillated, undoubtedly; but the extreme points of the oscillation were not very remote.' (Macaulay) Axis of oscillation, Center of oscillation. See Axis, and Center. ... Origin: L. Oscillat …

oscillator
Something that changes regularly or cyclically. ... Examples: oscillator neurons, which generate regular breathing or locomotory rhythms, slime moulds which secrete cyclic AMP in regular pulses. ... (18 Nov 1997) ...

Oscillatoria princeps
Large cyanobacterium that exhibits gliding movements, possibly involving the activity of helically arranged cytoplasmic fibrils of 6-9nm diameter. ... (18 Nov 1997) ...

oscillatory potential
The variable voltage in the positive deflection of the electroretinogram (B-wave) of the dark-adapted eye arising from amacrine cells. ... (05 Mar 2000) ...

oscillograph
An instrument that records oscillations, usually electrical. ... (05 Mar 2000) ...

oscillography
The study of the records made by an oscillograph. ... (05 Mar 2000) ...

oscillometer
An apparatus for measuring oscillations of any kind, especially those of the bloodstream in sphygmometry. ... See: sphygmo-oscillometer. ... Origin: L. Oscillo, to swing, + G. Metron, measure ... (05 Mar 2000) ...

oscillometric
Relating to the oscillometer or the records made by its use. ... (05 Mar 2000) ...

oscillometry
Measurement of oscillations of any kind. In medicine it is used in studying cardiovascular and respiratory physiology. ... (12 Dec 1998) ...

oscillopsia
The subjective sensation of oscillation of objects viewed. ... Synonym: oscillating vision. ... Origin: L. Oscillo, to swing, + G. Opsis, vision ... (05 Mar 2000) ...

oscilloscope
<instrument> An oscillograph in which the record of oscillations is continuously visible. ... Cathode ray oscilloscope (CRO), the common form of oscilloscope, in which a varying electrical signal (y) vertically deflects an electron beam impinging on a fluorescent screen, while some other function (x or time) deflects the beam horizontally; the …

oscitate
To yawn; to gape. ... Origin: L. Oscito, fr. Os, mouth, + cieo, to put in motion ... (05 Mar 2000) ...

oscitation
Synonym: yawning. ... Origin: L. Oscitatio ... (05 Mar 2000) ...

osculant
1. Kissing; hence, meeting; clinging. ... 2. <zoology> Adhering closely; embracing; applied to certain creeping animals, as caterpillars. ... 3. <biology> Intermediate in character, or on the border, between two genera, groups, families, etc, of animals or plants, and partaking somewhat of the characters of each, thus forming a connecting …

osculate
1. To kiss. ... 2. <geometry> To touch closely, so as to have a common curvature at the point of contact. See Osculation. ... Origin: L. Osculatus, p. P. Of osculari to kiss, fr. Osculum a little mouth, a kiss, dim. Of os mouth. See Oral, and cf. Oscillate. ... 1. To kiss one another; to kiss. ... 2. <geometry> To touch closely. See Osculat …

osculatory
Same as Pax. ... Origin: LL. Osculatorium. See Osculate. ... 1. Of or pertaining to kissing; kissing. 'The osculatory ceremony.' ... 2. <geometry> Pertaining to, or having the properties of, an osculatrix; capable of osculation; as, a circle may be osculatory with a curve, at a given point. Osculatory circle. ... <geometry> See Osculating c …