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

ultrashortwave diathermy
Shortwave diathermy in which the wavelength is under 10 meters. ... (05 Mar 2000) ...

ultrasonic
Relating to energy waves similar to those of sound but of higher frequencies (above 30,000 Hz). ... Origin: ultra-+ L. Sonus, sound ... (05 Mar 2000) ...

ultrasonic cardiography
Synonym for echocardiography ... Echocardiography is a diagnostic test which uses ultrasound waves to make images of the heart chambers, valves and surrounding structures. It can measure cardiac output and is a sensitive test for inflammation around the heart (pericarditis). It can also be used to detect abnormal anatomy or infections of the heart v …

ultrasonic cephalometry
Measurement of the foetal head by ultrasound. ... (05 Mar 2000) ...

ultrasonic egg recovery
Obtaining an egg for in vitro fertilization by means of an ultrasonically guided needle aspiration of ovarian follicles; may be performed transvesically or via the cul-de-sac. ... (05 Mar 2000) ...

ultrasonic lithotresis
The demolition of calculi by high frequency sound waves. ... (05 Mar 2000) ...

ultrasonic microscope
<instrument> A microscope that has lenses designed to use acoustic energy so that the ultrasonic wavelengths may be utilised; by means of transducers, the information is translated to a form that may be visualised or recorded. ... (05 Mar 2000) ...

ultrasonic nebuliser
A humidifier using high-frequency electricity to power a transducer that vibrates 1,350,000 times per second and changes water up into particles 0.5 to 3 um in size in its nebulizing chamber; used in inhalation therapy. ... (05 Mar 2000) ...

ultrasonic rays
See: ultrasonic. ... (05 Mar 2000) ...

ultrasonic scaler
An ultrasonic instrument that uses high frequency vibration to remove adherent deposits from the teeth. ... (05 Mar 2000) ...

ultrasonic therapy
The use of focused, high-frequency sound waves to produce local hyperthermia in certain diseased or injured parts of the body or to destroy the diseased tissue. ... (12 Dec 1998) ...

ultrasonic waves
The periodic configuration of energy produced by sound having a frequency greater than 30,000 Hz. ... (05 Mar 2000) ...

ultrasonics
That part of the science of acoustics dealing with the frequency range beyond the upper limit of perception by the human ear (beyond 20,000 hertz per second), but usually restricted to frequencies above 500,000 hertz per second. Ultrasonic radiation is injurious to tissues because of its thermal effects when absorbed by living matter, but in contro …

ultrasonogram
The image obtained by ultrasonography. ... See: echogram. ... Synonym: sonogram. ... (05 Mar 2000) ...

ultrasonograph
Computerised instrument used to create an image using ultrasound. ... Synonym: sonograph. ... Origin: ultra-+ L. Sonus, sound, + G. Grapho, to write ... (05 Mar 2000) ...

ultrasonographer
A person who performs and interprets ultrasonographic examinations. ... Synonym: echographer, sonographer. ... (05 Mar 2000) ...

ultrasonography
<investigation, procedure> A technique in which high-frequency sound waves are bounced off internal organs and the echo pattern is converted into a 2 dimensional picture of the structures beneath the transducer. ... (12 May 1997) ...

ultrasonography, doppler
Ultrasonography applying the doppler effect, with frequency-shifted ultrasound reflections produced by moving targets (usually red blood cells) in the bloodstream along the ultrasound axis in direct proportion to the velocity of movement of the targets, to determine both direction and velocity of blood flow. ... (12 Dec 1998) ...

ultrasonography, doppler, colour
Ultrasonography applying the doppler effect, with the superposition of flow information as colours on a gray scale in a real-time image. This type of ultrasonography is well-suited to identifying the location of high-velocity flow (such as in a stenosis) or of mapping the extent of flow in a certain region. ... (12 Dec 1998) ...

ultrasonography, doppler, duplex
Ultrasonography applying the doppler effect combined with real-time imaging. The real-time image is created by rapid movement of the ultrasound beam. A powerful advantage of this technique is the ability to estimate the velocity of flow from the doppler shift frequency. ... (12 Dec 1998) ...

ultrasonography, doppler, pulsed
Ultrasonography applying the doppler effect, with velocity detection combined with range discrimination. Short bursts of ultrasound are transmitted at regular intervals and the echoes are demodulated as they return. ... (12 Dec 1998) ...

ultrasonography, interventional
Ultrasonography using invasive or surgical procedures. Its widest application is intravascular ultrasound imaging but it is useful also in urology and intra-abdominal conditions. ... (12 Dec 1998) ...

ultrasonography, mammary
Use of ultrasound for imaging the breast. The most frequent application is the diagnosis of neoplasms of the female breast. ... (12 Dec 1998) ...

ultrasonography, prenatal
The visualization of tissues during pregnancy through recording of the echoes of ultrasonic waves directed into the body. The procedure may be applied with reference to the mother or the foetus and with reference to organs or the detection of maternal or foetal disease. ... (12 Dec 1998) ...

ultrasonosurgery
Use of ultrasound techniques to disrupt cells, tissues, or tracts, particularly in the central nervous system. ... (05 Mar 2000) ...

ultrasound
<investigation> A type of imaging technique which uses high-frequency sound waves. ... This is highly operator-dependent and is thought to be useful in diagnosis but not particularly accurate in the assessment of tumour response. For the latter, CT or MR imaging are more accurate. ... (16 Dec 1997) ...

ultrasound cardiography
Synonym for echocardiography ... Echocardiography is a diagnostic test which uses ultrasound waves to make images of the heart chambers, valves and surrounding structures. It can measure cardiac output and is a sensitive test for inflammation around the heart (pericarditis). It can also be used to detect abnormal anatomy or infections of the heart v …

ultrasound examination
<investigation> The use of high-frequency sound waves to locate a tumour inside the body. Helps determine if a breast lump is solid tissue or filled with fluids. ... (09 Oct 1997) ...

ultrasound guided biopsy
<procedure> The use of ultrasound to guide a biopsy needle to obtain a sample of tissue for analysis by a pathologist. ... (09 Oct 1997) ...

ultrasound imaging
Synonym for ultrasonography ... <investigation, procedure> A technique in which high-frequency sound waves are bounced off internal organs and the echo pattern is converted into a 2 dimensional picture of the structures beneath the transducer. ... (12 May 1997) ...

ultrasound of the breast
<investigation> A test which uses ultrasonic waves to scan the breast. Used to evaluate fibrocystic breast disease, breast implants or breast masses. ... (27 Sep 1997) ...

ultrasound-ultrasonography
A test in which high-frequency sound waves (ultrasound) are bounced off tissues and the echoes are converted into a picture (sonogram). ... (12 Dec 1998) ...

ultrastructural anatomy
<procedure> The ultramicroscopic study of structures too small to be seen with a light microscope. ... (05 Mar 2000) ...

ultrastructure
<pathology> General term to describe the level of organisation that is below the level of resolution of the light microscope. In practice, a shorthand term for structure observed using the electron microscope, although other techniques could give information about structure in the sub micrometre range. ... (18 Nov 1997) ...

ultratherm
A short-wave diathermy machine. ... Origin: ultra-+ G. Therme, heat ... (05 Mar 2000) ...

ultraviolet
<physics> Continuous spectrum beyond the violet end of the visible spectrum (wavelength less than 400nm) and above the X-ray wavelengths (greater than 5 nm). ... Glass absorbs UV, so optical systems at these wavelengths have to be of quartz. Nucleic acids absorb UV most strongly at around 260nm and this is the wavelength most likely to cause m …

ultraviolet A
Ultraviolet radiation from 320 to 400 nm that causes skin tanning but is very weakly sunburn-producing and carcinogenic. ... (05 Mar 2000) ...

ultraviolet B
Ultraviolet radiation from 290 to 320 nm that most effectively causes sunburning and tanning; excessive UVB exposure is a cause of cancer of fair skin. ... (05 Mar 2000) ...

ultraviolet C
Ultraviolet radiation from 200 to 290 nm; UVC in sunlight does not reach the surface of the earth; germicidal and mercury arc lamps may cause sunburn and photokeratitis. ... (05 Mar 2000) ...

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) ...

ultraviolet lamp
A lamp that emits rays in the ultraviolet band of the spectrum. ... See: ultraviolet. ... (05 Mar 2000) ...

ultraviolet microscope
<instrument> A microscope having optics of quartz and fluorite that allow transmission of light waves shorter than those of the visible spectrum, i.e., below 400 nm; the image is made visible by photography, fluorescence of special glasses, or television; in a scanning instrument the receptor is a multiplier phototube. ... (05 Mar 2000) ...

ultraviolet radiation
<physics> Invisible light, next to visible light in the electromagnetic spectrum. The most common source of ultraviolet radiation is the sun. ... Acronym: UV ... (16 Dec 1997) ...

ultraviolet rays
That portion of the electromagnetic spectrum immediately below the visible range and extending into the X-ray frequencies. The longer wavelengths (near-uv or biotic or vital rays) are necessary for the endogenous synthesis of vitamin d and are also called antirachitic rays; the shorter, ionizing wavelengths (far-uv or abiotic or extravital rays) ar …

ultraviolet spectrum
The electromagnetic spectrum beyond the violet end of the visible spectrum. ... (05 Mar 2000) ...

ultraviolet therapy
The use of ultraviolet electromagnetic radiation in the treatment of disease, usually of the skin. This is the part of the sun's spectrum that causes sunburn and tanning. Ultraviolet a, used in puva, is closer to visible light and less damaging than ultraviolet b, which is ionizing. ... (12 Dec 1998) ...

ultravirus
Synonym for virus ... <virology> Viruses are obligate intracellular parasites of living but noncellular nature, consisting of DNA or RNA and a protein coat. They range in diameter from 20-300nm. ... Class I viruses (Baltimore classification) have double stranded DNA as their genome. ... Class II have a single stranded DNA genome. ... Class III ha …

ultromotivity
Power of spontaneous movement. ... Origin: L. Ultro, beyond, on one's own part + L. Motio, movement ... (05 Mar 2000) ...

ultropaque method
A rapid method for examining thick (1 to 3 mm) sections of fresh tissue with the ultramicroscope, making use of an objective built in an illuminator so that the light is reflected down upon the tissue. ... (05 Mar 2000) ...

ululation
Rarely used term for the inarticulate crying of emotionally disturbed persons. ... Origin: L. Ululo, pp. -atus, to howl ... (05 Mar 2000) ...

Ulysses
Latin form of Greek mythological character. ... See: Ulysses syndrome. ... (05 Mar 2000) ...

Ulysses syndrome
<syndrome> The ill effects of extensive diagnostic investigations conducted because of a false-positive result in the course of routine laboratory screening. ... Origin: L. Ulysses, fr. G. Odysseus, myth. Char. ... (05 Mar 2000) ...

um
Symbol for micromolar. ... Symbol for micrometer. ... (05 Mar 2000) ...

umbel
<plant biology> A racemose inflorescence in which all the individual flower stalks arise in a cluster at the top of the peduncle and are of about equal length. ... (09 Oct 1997) ...

umbellate
Bearing umbels, consisting of umbels, forming an umbel or umbels. ... (09 Oct 1997) ...

umbelliferones
7-hydroxycoumarins. Substances present in many plants, especially umbelliferae. Umbelliferones are used in sunscreen preparations and may be mutagenic. Their derivatives are used in liver therapy, as reagents, plant growth factors, sunscreens, insecticide, parasiticides, choleretics, spasmolytics, etc. ... (12 Dec 1998) ...

umber
1. A brown or reddish pigment used in both oil and water colours, obtained from certain natural clays variously coloured by the oxides of iron and manganese. It is commonly heated or burned before being used, and is then called burnt umber; when not heated, it is called raw umber. See Burnt umber, below. ... 2. An umbrere. ... 3. [F. Ombre, umbre, L. …

umber codon
The termination codon UGA. ... Synonym: opal codon. ... (05 Mar 2000) ...

umber mutation
A mutation yielding the termination codon UGA, resulting in premature termination of a polypeptide chain. ... Compare: suppressor mutation. ... Synonym: opal mutation. ... (05 Mar 2000) ...

umbilical
<anatomy> As pertains to the umbilicus (belly button). ... (27 Sep 1997) ...

umbilical arteries
Either of a pair of arteries originating from the internal iliac artery and passing through the umbilical cord to carry blood from the foetus to the placenta. ... (12 Dec 1998) ...

umbilical artery
<anatomy, artery> Before birth the arteria is a continuation of the internal iliac; after birth it is obliterated between the bladder and umbilicus, forming the medial umbilical ligament, the remaining portion, between the internal iliac artery and bladder, being reduced in size and giving off the superior vesical arteries. ... Synonym: arteri …

umbilical cord
The flexible structure, giving passage to the umbilical arteries and vein, which connects the embryo or foetus to the placenta. ... (12 Dec 1998) ...

umbilical cyst
Synonym for vitellointestinal cyst ... A small red sessile or pedunculated tumour at the umbilicus in an infant; it is due to the persistence of a segment of the vitellointestinal duct. ... Synonym: umbilical cyst. ... (05 Mar 2000) ...

umbilical duct
Synonym for yolk stalk ... A narrow tube present in the early embryo that connects the midgut of the embryo (through the umbilical opening) to the yolk sac outside the embryo. Later in development, the yolk stalk is usually obliterated but a remnants of it may persist, most commonly as a finger-like protrusion from the small intestine known as mecke …

umbilical fissure
Synonym for fissure of round ligament of liver ... A cleft on the inferior surface of the liver, running from the inferior border to the left extremity of the porta hepatis; it lodges the round ligament of the liver. ... Synonym: fissura ligamenti teretis, fissure for ligamentum teres, fossa venae umbilicalis, umbilical fissure, umbilical fossa. ... ( …

umbilical fistula
A fistula of intestine or urachus at the umbilicus. ... (05 Mar 2000) ...

umbilical fossa
Synonym for fissure of round ligament of liver ... A cleft on the inferior surface of the liver, running from the inferior border to the left extremity of the porta hepatis; it lodges the round ligament of the liver. ... Synonym: fissura ligamenti teretis, fissure for ligamentum teres, fossa venae umbilicalis, umbilical fissure, umbilical fossa. ... ( …

umbilical fungus
A mass of granulation tissue on the stump of the umbilical cord in the newborn. ... Yeast fungus, obsolete term for Saccharomyces. ... (05 Mar 2000) ...

umbilical hernia
<surgery> An abnormal protrusion of internal abdominal contents into a defect in the umbilical area. Common in the newborn, but usually resolves by age two. ... (27 Sep 1997) ...

umbilical notch
Synonym for notch for round ligament of liver ... The notch in the inferior border of the liver that accommodates the round ligament. ... Synonym: incisura ligamenti teretis hepatis, incisura umbilicalis, umbilical notch. ... (05 Mar 2000) ...

umbilical prevesical fascia
The thin fascial layer interposed between the transversalis fascia and the umbilicovesical fascia It extends between the medial umbilical ligaments from the umbilicus downward in front of the bladder, forming the posterior boundary of the retropubic space. ... (05 Mar 2000) ...

umbilical region
The central region of the abdomen about the umbilicus. ... Synonym: regio umbilicalis. ... (05 Mar 2000) ...

umbilical ring
An opening in the linea alba through which pass the umbilical vessels in the foetus; in young embryos it is relatively nearer to the pubis, but gradually ascends to the centre of the abdomen; it is closed in the adult, its site being indicated by the umbilicus or navel. ... Synonym: annulus umbilicalis, canalis umbilicalis. ... (05 Mar 2000) ...

umbilical souffle
Synonym for foetal souffle ... <obstetrics, paediatrics> A blowing murmur, synchronous with the foetal heart beat, sometimes only systolic and sometimes continuous, heard on auscultation over the pregnant uterus. ... Synonym: funic souffle, funicular souffle, umbilical souffle. ... (05 Mar 2000) ...

umbilical vein
See: left umbilical vein. ... (05 Mar 2000) ...

umbilical veins
Veins which carry oxygenated, nutrient-rich blood from the placenta and which are obliterated in the first few days after birth. ... (12 Dec 1998) ...

umbilical vesicle
Synonym for yolk sac ... <embryology, ornithology> One of the set of extra embryonic membranes, growing out from the gut over the yolk surface, in birds formed from the splanchnopleure, an outer layer of splanchnic mesoderm and an inner layer of endoderm. ... (18 Nov 1997) ...

umbilicated cataract
Synonym for annular cataract ... Congenital cataract in which a central white membrane replaces the nucleus. ... Synonym: disk-shaped cataract, life-belt cataract, umbilicated cataract. ... (05 Mar 2000) ...

umbilication
1. A pit or navel-like depression. ... 2. Formation of a depression at the apex of a papule, vesicle, or pustule. ... (05 Mar 2000) ...

umbilicomammillary triangle
A triangle with its apex at the umbilicus and its base at the line joining the nipples. ... (05 Mar 2000) ...

umbilicovesical fascia
A thin fascial layer that extends between the medial umbilical ligaments and is continuous with fascia enclosing the bladder. ... (05 Mar 2000) ...

umbilicus
1. <anatomy> The depression, or mark, in the median line of the abdomen, which indicates the point where the umbilical cord separated from the foetus; the navel. ... 2. An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled. ... 3. <botany> The hilum. ... 4. <zoology> A depression or …

umbo
<otolaryngology> The area on the tympanic membrane where the malleus attaches. ... (27 Sep 1997) ...

umbo membranae tympani
Synonym for umbo of tympanic membrane ... The projection on the inner surface of the tympanic membrane at the end of the manubrium of the malleus; this corresponds to the most depressed point of the membrane, viewed laterally, that is commonly called the umbo. ... Synonym: umbo membranae tympani, umbo. ... (05 Mar 2000) ...

umbo of tympanic membrane
The projection on the inner surface of the tympanic membrane at the end of the manubrium of the malleus; this corresponds to the most depressed point of the membrane, viewed laterally, that is commonly called the umbo. ... Synonym: umbo membranae tympani, umbo. ... (05 Mar 2000) ...

umbra
Origin: L, a shadow. ... 1. <astronomy> The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; used in contradistinction from penumbra. See Penumbra. The central dark portion, or nucleus, of a sun spot. ... The fainter part of a sun spot; now mor …

umbrage
1. Shade; shadow; obscurity; hence, that which affords a shade, as a screen of trees or foliage. 'Where highest woods, impenetrable To star or sunlight, spread their umbrage broad.' (Milton) ... 2. Shadowy resemblance; shadow. 'The opinion carries no show of truth nor umbrage of reason on its side.' (Woodward) ... 3. The feeling of being overshadowed …

umbrageous
1. Forming or affording a shade; shady; shaded; as, umbrageous trees or foliage. 'Umbrageous grots and caves Of cool recess, o'er which the mantling vine Lays forth her purple grape.' (Milton) ... 2. Not easily perceived, as if from being darkened or shaded; obscure. ... 3. Feeling jealousy or umbrage; taking, or disposed to take, umbrage; suspicious …

Umbre virus
An arbovirus related serologically to the Turlock virus. ... (05 Mar 2000) ...

umbrella
1. A shade, screen, or guard, carried in the hand for sheltering the person from the rays of the sun, or from rain or snow. It is formed of silk, cotton, or other fabric, extended on strips of whalebone, steel, or other elastic material, inserted, or fastened to, a rod or stick by means of pivots or hinges, in such a way as to allow of being opened …

umbridae
A family of salmoniformes comprising the mudminnows. There are three genera: dallia, novumbra, and umbra with much disagreement about their taxonomic interrelations. The umbridae are freshwater fish inhabiting parts of the northern hemisphere. (nelson: fishes of the world) ... (12 Dec 1998) ...

umol
Symbol for micromole. ... (05 Mar 2000) ...

UMP
<abbreviation> Uridine 5'-monophosphate. ... (05 Mar 2000) ...

UMP synthase
Synonym for uridylic acid ... Uridine esterified by phosphoric acid on one or more sugar hydroxyl groups; UMP is typically uridine 5'-monophosphate; 2' and 3' derivatives also occur; precursor for the biosynthesis of other pyrimidine nucleotides. ... Synonym: UMP synthase, uridine 5'-monophosphate. ... Uridylic acid synthase, a bifunctional enzyme tha …

un-
<prefix> An inseparable prefix, or particle, signifying not; in-; non-. In- is prefixed mostly to words of Latin origin, or else to words formed by Latin suffixes; un- is of much wider application, and is attached at will to almost any adjective, or participle used adjectively, or adverb, from which it may be desired to form a corresponding n …

unarmed rostellum
Rostellum lacking hooks. ... (05 Mar 2000) ...

unavoidable
1. Not avoidable; incapable of being shunned or prevented; inevitable; necessary; as, unavoidable troubles. ... 2. Not voidable; incapable of being made null or void. ... <medicine> Unavoidable hemorrhage, hemorrhage produced by the afterbirth, or placenta, being situated over the mouth of the womb so as to require detachment before the child c …

unavoidable haemorrhage
An obsolete term for haemorrhage occurring during labour in cases of placenta previa, as distinguished from accidental haemorrhage. ... (05 Mar 2000) ...

unbalanced translocation
<genetics, molecular biology> A genetic translocation that results in the loss of a part of a chromosome or causes other genome damage. ... (09 Oct 1997) ...