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

operculigenous
<marine biology, zoology> Producing an operculum; said of the foot, or part of the foot, of certain mollusks. ... Origin: Operculum + -genous. ... (19 Mar 1998) ...

operculitis
Originating under an operculum. ... Origin: operculum + G. -itis, inflammation ... (05 Mar 2000) ...

operculum
A lid or cover becoming detached at maturity by abscission, in Eucalyptus (for example), a cap covering the bud and formed by fusion or cohesion of perianth parts. ... (09 Oct 1997) ...

operculum ilei
Synonym for ileal sphincter ... A thickening of circular musculature at the free margin of the ileal papilla. ... Synonym: ileocaecocolic sphincter, marginal sphincter, operculum ilei, Varolius' sphincter. ... (05 Mar 2000) ...

operon
<molecular biology> Groups of bacterial genes with a common promotor, that are controlled as a unit and produce mRNA as a single piece, polycistronic messenger. An operon consists of two or more structural genes, which usually code for proteins with related metabolic functions and associated control elements that regulate the transcription of …

ophiasis
A form of alopecia areata in which the loss of hair occurs in bands along the scalp margin partially or completely encircling the head. ... Origin: G., fr. Ophis, snake ... (05 Mar 2000) ...

ophidia
<zoology> The order of reptiles which includes the serpents. ... The most important divisions are: the Solenoglypha, having erectile perforated fangs, as the rattlesnake; the Proteroglypha, or elapine serpents, having permanently erect fang, as the cobra; the Asinea, or colubrine serpents, which are destitute of fangs; and the Opoterodonta, or …

ophidiasis
Poisoning by a snake. ... Synonym: ophidism. ... Origin: G. Ophidion, dim. Of ophis, a serpent ... (05 Mar 2000) ...

ophidiophobia
<psychology> Morbid fear of snakes. ... Origin: G. Ophidion, a small snake, + phobos, fear ... (05 Mar 2000) ...

ophidism
Synonym for ophidiasis ... Poisoning by a snake. ... Synonym: ophidism. ... Origin: G. Ophidion, dim. Of ophis, a serpent ... (05 Mar 2000) ...

ophritis
Dermatitis in the region of the eyebrows. ... Synonym: ophryitis. ... Origin: G. Ophrys, eyebrow, + -itis, infammation ... (05 Mar 2000) ...

ophryitis
Synonym for ophritis ... Dermatitis in the region of the eyebrows. ... Synonym: ophryitis. ... Origin: G. Ophrys, eyebrow, + -itis, infammation ... (05 Mar 2000) ...

ophryogenes
Related to the eyebrows. ... Origin: Mod. L., fr. G. Ophrys, eyebrow, + suffix -genes, arising from ... (05 Mar 2000) ...

Ophryoscolecidae
A family of ciliate protozoa occurring in the rumen and reticulum of ruminant animals, characterised by having cilia arranged in spiral membranelles around the mouth (adoral) and in some genera also in a dorsal (metoral) position. The most important genera are Entodinium, Diplodinium, Epidinium, and Ophryoscolex, which are thought to contribute to …

ophryosis
Spasmodic twitching of the upper portion of the orbicularis palpebrarum muscle causing a wrinkling of the eyebrow. ... Origin: G. Ophrys, eyebrow, + -osis, condition ... (05 Mar 2000) ...

ophryospinal angle
See: Jacquart's facial angle. ... (05 Mar 2000) ...

ophthalm-
See: ophthalmo-. ... (05 Mar 2000) ...

ophthalmalgia
Synonym: oculodynia. ... Origin: ophthalmo-+ G. Algos, pain ... (05 Mar 2000) ...

ophthalmia eczematosa
An obsolete term for phlyctenular conjunctivitis. ... (05 Mar 2000) ...

ophthalmia neonatorum
Acute conjunctival inflammation in the newborn, usually caused by maternal gonococcal infection. The causative agent is neisseria gonorrhoeae. The baby's eyes are contaminated during passage through the birth canal. ... (12 Dec 1998) ...

ophthalmia nivalis
Synonym for ultraviolet keratoconjunctivitis ... Acute keratoconjunctivitis resulting from exposure to intense ultraviolet irradiation. ... Synonym: actinic conjunctivitis, arc-flash conjunctivitis, flash keratoconjunctivitis, ophthalmia nivalis, snow conjunctivitis, welder's conjunctivitis. ... (05 Mar 2000) ...

ophthalmia nodosa
The presence of nodular swellings on the conjunctiva, due to penetration of ocular tissues by the hairs of caterpillars. ... Synonym: caterpillar-hair ophthalmia. ... (05 Mar 2000) ...

ophthalmia, sympathetic
Granulomatous uveitis which follows in one eye after a penetrating injury to the other eye; the secondarily affected eye is called the sympathizing eye, and the injured eye is called the exciting or activating eye. ... (12 Dec 1998) ...

ophthalmic
<anatomy> Pertaining to the eye. ... (18 Nov 1997) ...

ophthalmic acid
A tripeptide occurring in lens, similar to glutathione but differing in the replacement of cysteine by alpha-amino-n-butyric acid (i.e., in the replacement of -SH by -CH3); a potent inhibitor of glyoxalase. ... Compare: norophthalmic acid. ... (05 Mar 2000) ...

ophthalmic artery
<anatomy, artery> Artery originating from the internal carotid artery and distributing to the eye, orbit and adjacent facial structures. ... (12 Dec 1998) ...

ophthalmic assistants
Persons academically trained to care for patients with eye diseases or structural defects of the eye, under the supervision of an ophthalmologist. ... (12 Dec 1998) ...

ophthalmic nerve
<anatomy, nerve> A sensory branch of the trigeminal (5th cranial) nerve. The ophthalmic nerve carries general afferents from the superficial division of the face including the eyeball, conjunctiva, upper eyelid, upper nose, nasal mucosa, and scalp. ... (12 Dec 1998) ...

ophthalmic ointment
A special ointment for application to the eye that must be free from particles and must be nonirritating to the eye. ... Synonym: eye ointment, oculentum. ... (05 Mar 2000) ...

ophthalmic plexus
An autonomic plexus, entering the orbit in company with the ophthalmic artery, derived from the internal carotid plexus. ... Synonym: plexus ophthalmicus. ... (05 Mar 2000) ...

ophthalmic solutions
Sterile solutions, essentially free from foreign particles and suitably compounded and dispensed, for instillation into the eye. It does not include solutions for cleaning eyeglasses or contact lens solutions. ... (12 Dec 1998) ...

ophthalmic veins
See: inferior ophthalmic vein, superior ophthalmic vein. ... (05 Mar 2000) ...

ophthalmic vesicle
In the embryo, one of the paired evaginations from the ventrolateral walls of the forebrain from which the sensory and pigment layers of the retina develop. ... Synonym: vesicula ophthalmica, ocular vesicle, optic vesicle. ... (05 Mar 2000) ...

ophthalmo-
Relationship to the eye. ... See: oculo-. ... Origin: G. Ophthalmos ... (05 Mar 2000) ...

ophthalmodynamometer
An instrument to measure the blood pressure in the retinal vessels. ... Origin: ophthalmo-+ G. Dynamis, power, + metron, measure ... (05 Mar 2000) ...

ophthalmodynamometry
Measurement of the blood pressure of the retinal vessels. It is used also for the determination of the near point of convergence (convergence, ocular). ... (12 Dec 1998) ...

ophthalmolith
Synonym: dacryolith. ... Origin: ophthalmo-+ G. Lithos, stone ... (05 Mar 2000) ...

ophthalmologic
<anatomy> Pertaining to ophthalmology. ... (18 Nov 1997) ...

ophthalmologic surgical procedures
Surgery performed on the eye or any of its parts. ... (12 Dec 1998) ...

ophthalmologist
<specialist> A physician specialist expert in the treatment of diseases of the eyeball and retina. ... (27 Sep 1997) ...

ophthalmology
<study> The area of medicine dealing with the eye. ... (18 Nov 1997) ...

ophthalmomalacia
Abnormal softening of the eyeball. ... Origin: ophthalmo-+ G. Malakia, softness ... (05 Mar 2000) ...

ophthalmomandibulomelic dysplasia
An autosomal dominant disorder with corneal clouding and multiple abnormalities of the mandible and limbs. ... (05 Mar 2000) ...

ophthalmomelanosis
Melanotic discoloration of the conjunctiva and adjoining tissues. ... (05 Mar 2000) ...

ophthalmomycosis
Any disease of the eye or its appendages caused by a fungus. ... Origin: ophthalmo-+ G. Mykes, fungus, + -osis, condition ... (05 Mar 2000) ...

ophthalmomyiasis
Synonym for ocular myiasis ... Invasion of the conjunctival sac or eyeball by larvae of flies, e.g., Hypoderma bovis, H. Lineata, Sarcophaga, or Gasterophilus intestinalis. ... Synonym: ophthalmomyiasis. ... (05 Mar 2000) ...

ophthalmopathy
: Eye disease. ... (12 Dec 1998) ...

ophthalmoplegia
Paralysis of the ocular muscles, innervated by the oculomotor, trochlear, and abducens nerves. ... (12 Dec 1998) ...

ophthalmoplegia externa
Paralysis affecting one or more of the extrinsic eye muscles. ... Synonym: external ophthalmoplegia. ... (05 Mar 2000) ...

ophthalmoplegia interna
Paralysis affecting only the sphincter muscle of the pupil and the ciliary muscle. ... Synonym: internal ophthalmoplegia. ... (05 Mar 2000) ...

ophthalmoplegia internuclearis
Ophthalmoplegia in lesions of the medial longitudinal fasciculus, with failure of adduction in horizontal gaze but with retention of convergence. ... (05 Mar 2000) ...

ophthalmoplegia partialis
Incomplete ophthalmoplegia involving only one or two of the extrinsic or intrinsic ocular muscles. ... (05 Mar 2000) ...

ophthalmoplegia progressiva
Progressive upper bulbar palsy, due to degeneration of the nuclei of the motor nerves of the eye. ... (05 Mar 2000) ...

ophthalmoplegia totalis
Paralysis of both the extrinsic and intrinsic ocular muscles. ... (05 Mar 2000) ...

ophthalmoplegic
Relating to or marked by ophthalmoplegia. ... (05 Mar 2000) ...

ophthalmoplegic migraine
A form of migraine associated with paralysis of the extraocular muscles. ... (05 Mar 2000) ...

ophthalmoscopes
Instruments containing a perforated mirror and lenses to examine the interior of the eye. ... (12 Dec 1998) ...

ophthalmoscopic
Relating to examination of the interior of the eye. ... (05 Mar 2000) ...

ophthalmoscopy
<procedure> Observation of the optic disc, retina and blood vessels. May be examined by direct or indirect ophthalmoscopy. In direct ophthalmoscopy the examiner uses an ophthalmoscope the size of a flashlight to shine a beam of light into your eye. In indirect ophthalmoscopy a head lamp device is used and a much brighter light. Visualisation …

ophthalmoscopy with reflected light
Examination of that part of the fundus adjacent to an area illuminated by a sharply focused light. ... (05 Mar 2000) ...

ophthalmotrope
A model of the two eyes, to each of which are attached weighted cords pulling in the direction of the six extrinsic eye muscles; used to demonstrate the action of the ocular muscles singly or in various combinations. ... Origin: ophthalmo-+ G. Tropos, a turning ... (05 Mar 2000) ...

ophthalmovascular
Relating to the blood vessels of the eye. ... (05 Mar 2000) ...

opiate
<pharmacology> A remedy containing or derived from opium, also any drug that induces sleep. ... Naturally occuring basic (alkaloid) molecules with a complex fused ring structure. Have high pharmacological activity. ... See: morphine. ... (18 Nov 1997) ...

opiate receptor
<pharmacology> Opiate-binding sites found throughout primary afferents and the neuraxis. ... (16 Dec 1997) ...

opiate receptors
Regions of the brain which have the capacity to bind morphine; some, along the aqueduct of Sylvius and in the centre median, are in areas related to pain, but others, as in the striatum, are not related. ... (05 Mar 2000) ...

opine
<molecular biology> Compound produced by plant cells containing T DNA: induce transfer genes on Ti plasmids. ... (18 Nov 1997) ...

opioid
Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics. ... (05 Mar 2000) ...

opioid agonist
<pharmacology> Any morphine-like compound that produces bodily effects including pain relief, sedation, constipation and respiratory depression. ... (16 Dec 1997) ...

opioid antagonists
Agents such as naloxone and naltrexone which have high affinity for opiate receptors but do not activate these receptors. These drugs block the effects of exogenously administered opioids such as morphine, heroin, meperidine, and methadone, or of endogenously released endorphins and enkephalins. ... (05 Mar 2000) ...

opioid partial agonist
<pharmacology> A compound that has an affinity for and stimulates physiologic activity at the same cell receptors as opioid agonists but that produces only a partial (i.e., submaximal) bodily response. ... (16 Dec 1997) ...

opioid peptides
The endogenous peptides with opiate-like activity. The three major classes currently recognised are the enkephalins, the dynorphins, and the endorphins. Each of these families derives from different precursors, proenkephalin, prodynorphin, and pro-opiomelanocortin, respectively. There are also at least three classes of opioid receptors, but the pep …

opioid receptor
<pharmacology> A membrane protein, widely distributed in animal cells, but especially in the brain (enkephalin receptors) and gut. The natural ligands are the opiate peptide neurotransmitters, but the name is given because opiates are potent agonists that occupy the receptors and mimic the action of the natural transmitters. ... (18 Nov 1997)< …

opioid-related disorders
Disorders related or resulting from abuse or mis-use of opioids. ... (12 Dec 1998) ...

opiomelanocortin
A linear polypeptide of the pituitary gland that contains in its sequence the sequences of endorphins, MSH, ACTH, and the like, which are split off enzymically; the nucleotide sequences coding has been determined for several species. ... (05 Mar 2000) ...

opipramol
<chemical> A tricyclic antidepressant with actions similar to amitriptyline. ... Pharmacological action: adrenergic uptake inhibitors, antidepressive agents, tricyclic. ... Chemical name: 1-Piperazineethanol, 4-(3-(5H-dibenz(b,f)azepin-5-yl)propyl)- ... (12 Dec 1998) ...

opipramol hydrochloride
4-[3-(5H-Dibenz[b.f ]azepin-5-yl)propyl]-1-piperazineethanol dihydrochloride; an antidepressant agent. ... (05 Mar 2000) ...

opisthenar
Dorsum of the hand. ... Origin: G. Back of the hand, from opisthen, behind, + thenar, palm of the hand ... (05 Mar 2000) ...

opisthiobasial
Relating to both opisthion and basion; denoting a line connecting the two, or the distance between them. ... (05 Mar 2000) ...

opisthionasial
Relating to the opisthion and the nasion; denoting the distance between the two points. ... (05 Mar 2000) ...

opistho-
Backward, behind, dorsal. ... Origin: G. Opisthen, at the rear, behind ... (05 Mar 2000) ...

opisthocheilia
Opisthochilia ... Recession of the lips. ... Origin: opistho-+ G. Cheilos, lip ... (05 Mar 2000) ...

opisthomastigote
Term now used instead of herpetomonad for the stage of development of certain insect and plant parasitizing flagellates to avoid confusion between the stage and the genus Herpetomonas. In this stage the flagellum arises from the kinetoplast located behind the nucleus and emerges from the anterior end of the organism; an undulating membrane is absen …

opisthoporeia
Involuntary backward gait; frequently connected with parkinsonism. ... Origin: opistho-+ G. Poreia, a walking, fr. Poreuo, to go, walk ... (05 Mar 2000) ...

opisthorchiasis
Infection with flukes of the genus opisthorchis. ... (12 Dec 1998) ...

opisthorchid
Common name for members of the family Opisthorchiidae. ... (05 Mar 2000) ...

opisthorchidae
A family of lanceolate liver flukes of the class trematoda which occurs in animals and man. There are several genera including amphimerus, cyclorchis, delphinicola, metorchis, parametorchis, phocitrema, clonorchis, and opisthorchis. ... (12 Dec 1998) ...

Opisthorchiidae
A family of trematodes that includes the genera Opisthorchis and Clonorchis. ... (05 Mar 2000) ...

opisthorchis
A genus of trematode liver flukes of the family opisthorchidae. It consists of the following species: o. Felineus, o. Noverca (amphimerus noverca), and o. Viverrini. The intermediate hosts are snails, fish, and amphibia. ... (12 Dec 1998) ...

Opisthorchis sinensis
Synonym for clonorchis sinensis ... <radiology> Liver fluke, endemic to China, Japan, SE Asia, (?) cause of Oriental cholangitis, associated with cholangiocarcinoma !, bile duct is preferred site, snail reservoir leading to fresh water fish, XR: multiple stones in common bile duct ... (12 Dec 1998) ...

Opisthorchis viverrini
A species closely related to Opisthorchis felineus, very common in man in Thailand; causes opisthorchiasis. ... (05 Mar 2000) ...

opisthotonic
Relating to or characterised by opisthotonos. ... (05 Mar 2000) ...

opisthotonoid
Resembling opisthotonos. ... (05 Mar 2000) ...

opisthotonos
<neurology> A form of spasm in which the head and the heels are bent backward and the body bowed forward. ... Origin: Gr. Tonos = tension ... (18 Nov 1997) ...

opisthotonus
Spasm of the body where the head and heels are bent backward and the body is bowed forward. A type of extrapyramidal effect. ... (27 Sep 1997) ...

Opitz
John M., U.S. Paediatrician, *1935. ... See: Smith-Lemli-Opitz syndrome. ... (05 Mar 2000) ...

opium
<chemistry> The inspissated juice of the Papaver somniferum, or white poppy. ... Opium is obtained from incisions made in the capsules of the plant, and the best flows from the first incision. It is imported into Europe and America chiefly from the Levant, and large quantities are sent to China from India, Persia, and other countries. It is of …

opo-
1. The face; an eye. ... See: fascio-. ... 2. Juice, balm. ... Origin: G. Ops ... (05 Mar 2000) ...

opodidymus
Conjoined twins with a single body having two heads fused at the back with partially separated facial regions. ... See: conjoined twins. ... Origin: G. Ops, eye, face, + didymos, twin ... (05 Mar 2000) ...

opopanax
The inspissated juice of an umbelliferous plant (the Opoponax Chironum), brought from Turkey and the East Indies in loose granules, or sometimes in larger masses, of a reddish yellow colour, with specks of white. It has a strong smell and acrid taste, and was formerly used in medicine as an emmenagogue and antispasmodic. ... Origin: L, fr. Gr.; vege …

opossum
<zoology> Any American marsupial of the genera Didelphys and Chironectes. The common species of the United States is Didelphys Virginiana. ... Several related species are found in South America. The water opossum of Brazil (Chironectes variegatus), which has the hind feet, webbed, is provided with a marsupial pouch and with cheek pouches. It i …