A disorder caused by the bacterium Mycobacterium ulcerans that starts as a painless swelling in the skin, most commonly in the limbs (the arms and legs) and causes severely ...
An ulcer (a hole in the lining) of the duodenum (the first portion of the small intestine). Ulcer formation is related to H. pyloridus bacteria in the stomach, anti-inflammatory ...
A hole in the lining of the esophagus (tube-like organ leading from the throat to the stomach) corroded by the acidic digestive juices secreted by the stomach cells. Ulcer ...
A hole in the lining of the stomach corroded by the acidic digestive juices which are secreted by the stomach cells. Ulcer formation is related to H. pyloridus bacteria in the ...
A peptic ulcer is a hole in the lining of the stomach, duodenum, or esophagus. A peptic ulcer of the stomach is called a gastric ulcer, an ulcer of the duodenum is a duodenal ...
A stasis ulcer is an ulcer (a crater) that develops in an area in which the circulation is sluggish and the venous return (the return of venous blood toward the heart) is poor. ...
The process or fact of being eroded away, as by an ulcer.
* * *
1. The formation of an ulcer. 2. An ulcer or aggregation of ulcers.
- tracheal u. erosion of the tracheal ...
Relating to, causing, or marked by an ulcer or ulcers.
A relatively common disease that causes inflammation of the large intestine (the colon). The cause is unknown. Ulcerative colitis is a form of inflammatory bowel disease. It has ...
This is trench mouth, a progressive painful infection with ulceration, swelling and sloughing off of dead tissue from the mouth and throat due to the spread of infection from the ...
Ulcerative colitis that is limited to the rectum. Ulcerative colitis itself is a relatively common disease involving inflammation of the large intestine (the colon). The cause ...
Denoting a local ulceration at a site of infection followed by regional or generalized lymphadenopathy.
Relating to or characterized by ulceration and the formation of a false membrane.
A defect of the cerebral cortex characterized by narrow and distorted gyri; may be congenital or the result of scars. [G. oule, scar, + gyros, ring]
Scarring with erythema. [G. oule, scar, + erythema, redness of the skin]
- u. ophryogenes folliculitis of the eyebrows resulting in scarring and alopecia.
A lectin that reacts specifically with α-l-fucose, used as a marker for endothelial cells in paraffin sections.
Emerich, Hungarian surgeon, 1861–1937. See U. line, U. syndrome.
Otto, German physician, 1894–1957. See Morquio-U. disease.
Ullrich congenital muscular dystrophy
A disorder evident at birth characterized by muscle weakness, contractures of multiple joints, and hyperextensibility (looseness) of joints, particularly distal joints (well away ...
The medial and larger of the two bones of the forearm. SYN: cubitus (2) [TA]. [L. elbow, arm, fr. G. olene]
In a direction toward the ulna. [ulna + L. ad, to]
Relating to the ulna, or to any of the structures ( e.g., artery, nerve) named from it; relating to the u. or medial aspect of the upper limb. SYN: ulnaris [TA].
Relating to the ulna independent of other structures. [ulna + G. en, in]
Relating to the ulna and the carpus, or to the ulnar side of the wrist.
Relating to both ulna and radius; denoting the two articulations, ligaments, etc., between them.
1. Scar, scarring. [G. oule] 2. The gums. SEE ALSO: gingivo-. [G. oulon] 3. Curly. [G. oulo-, ouli-, woolly.]
Cancer of the gums. It is often associated with the use of smokeless (chewing) tobacco. Diagnosis is by observation and confirmed by biopsy. Treatment may include radiation, ...
1. Resembling a scar. 2. A scarlike lesion due to a degenerative process in deeper layers of skin. [G. oule, scar + eidos, resemblance]
Having curly hair. Cf.:leiotrichous. [G. oulotrichos, curly haired, fr. oulos, wooly, + thrix (trich-), hair]
In embryology, relating to the caudal-most pharyngeal pouch. [L. ultimus, last, + G. branchia, gills]
The right atrium of the heart, said to contract after the rest of the heart is still. [L. the last thing dying]
Excess, exaggeration, beyond. [L. beyond]
A high-speed centrifuge (up to 100,000 rpm) by means of which large molecules, e.g., of protein or nucleic acid s, are caused to sediment at practicable rates; used for ...
Former name for micropore. [ ultra- + G. kytos, cell, + stoma, mouth]
Relating to biologic variations or rhythms occurring in cycles more frequent than every 24 hours. Cf.:circadian, infradian. [ ultra- + L. dies, day]
Electron beam computerized tomography (EBCT), a new (and controversial) noninvasive test for the detection of coronary artery disease (CAD). Ultrafast computerized tomography ...
A semipermeable membrane ( collodion, fish bladder, or filter paper impregnated with gels) used as a filter to separate colloids and large molecules from water and small ...
Filtration through a semipermeable membrane or any filter that separates colloid solutions from crystalloids or separates particles of different size in a colloid mixture.
Ligation of a blood vessel beyond the point where a branch is given off.
A microscope that utilizes refracted light for visualizing objects not visible with the ordinary microscope when direct light is used.
A microtome used in cutting sections 0.1 μm thick, or less, for electron microscopy.
The cutting of ultrathin sections for electron microscopy by use of an ultramicrotome.
Relating to energy waves similar to those of sound but of higher frequencies (above 30,000 Hz). [ ultra- + L. sonus, sound]
Liposuction involves the surgical suctioning of fat deposits from specific parts of the body, the most common being the abdomen (the "tummy"), buttocks ("behind"), hips, thighs ...
The science and technology of ultrasound, its characteristics and phenomena.
The image obtained by ultrasonography. SEE ALSO: echogram. SYN: sonogram.
Computerized instrument used to create an image using ultrasound. SYN: sonograph. [ ultra- + L. sonus, sound, + G. grapho, to write]
A person who performs and/or interprets ultrasonographic examinations. SYN: echographer, sonographer.
The location, measurement, or delineation of deep structures by measuring the reflection or transmission of high frequency or ultrasonic waves. Computer calculation of the ...
Use of ultrasound techniques to disrupt cells, tissues, or tracts, particularly in the central nervous system.
High-frequency sound waves. Ultrasound waves can be bounced off of tissues using special devices. The echoes are then converted into a picture called a sonogram. Ultrasound ...
Ultrasound during pregnancy
Ultrasound imaging has been done during pregnancy for over three decades. It has proved to be a very useful and very effective diagnostic procedure. A number of epidemiological ...
A form of ultrasound that can detect and measure blood flow. Doppler ultrasound depends on the Doppler effect, a change in the frequency of a wave resulting here from the motion ...
A technique in which sound waves are sent out by an ultrasound probe that has been inserted in the vagina. The waves go through the vaginal wall and bounce off the ovaries, and a ...
: A test in which high-frequency sound waves (ultrasound) are bounced off tissues and the echoes are converted into a picture
Structures or particles seen with the electron microscope. SYN: fine structure.
A short-wave diathermy machine. [ ultra- + G. therme, heat]
Denoting electromagnetic rays at higher frequency than the violet end of the visible spectrum.
- u. A (UVA) u. radiation from 320 to 400 nm that causes skin tanning but is very ...
One of the three types of invisible light rays (together with ultraviolet B and ultraviolet C) given off by the sun. Although ultraviolet C is the most dangerous type of ...
One of the three types of invisible light rays (together with ultraviolet A and ultraviolet C) given off by the sun. Although ultraviolet C is the most dangerous type of ...
One of the three types of invisible light rays (together with ultraviolet A and ultraviolet B) given off by the sun. Although ultraviolet C is the most dangerous type of ...
Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation can burn the skin and cause skin cancer. Ultraviolet radiation is made up of three types ...
Power of spontaneous movement. [L. ultro, beyond, on one's own part + L. motio, movement]
Rarely used term for the inarticulate crying of emotionally disturbed persons. [L. ululo, pp. -atus, to howl]
Latin form of Greek mythological character. See U. syndrome.
Relating to the umbilicus. SYN: omphalic.
The cord that connects the developing fetus with the placenta. Within this cord run the two umbilical arteries and the umbilical vein. At birth, the umbilical cord is clamped and ...
1. A pit or navellike depression. 2. Formation of a depression at the apex of a papule, vesicle, or pustule.
The vestige left behind on a newborn’s belly when the umbilical cord is cut. Also called the navel or belly button.
* * *
The pit in the center of the abdominal wall marking ...
1. [NA] A projecting point of a surface. 2. SYN: u. of tympanic membrane. [L. boss of a shield, a knob]
- u. membranae tympani [TA] SYN: u. of tympanic membrane.
- u. of ...
Abbreviation for uridine 5′-monophosphate.
1. Not, akin to L. in- and G. a-, an-. 2. Reversal, removal, release, deprivation. 3. An intensive action. [M.E.]
Denoting or relating to the uncus.
You may be uncertain why "uncertainty" deserves a place in a medical dictionary but some would say that uncertainty is a key element in medicine. "The core predicament of medicine ...
An ounce. [L. a twelfth part, an ounce]
SYN: uncinate. [L. uncus, hook, + forma, form]
SYN: hamate (bone). [Mod. L. unciform]
A genus of nematode hookworms that infect various mammals. Species include U. stenocephala, the European hookworm of dogs, cats, and various wild carnivores, also found in North ...
1. Hooklike or hook-shaped. 2. Relating to an uncus or, specifically, to the u. gyrus (2) or a process of the pancreas or of a vertebra. SYN: unciform. [L. uncinatus]
Arrest of hemorrhage from a cut artery by pressure with a blunt hook. [L. uncus, hook]
1) Interruption of awareness of oneself and one’s surroundings, lack of the ability to notice or respond to stimuli in the environment. A person may become unconscious due to ...
A partial or complete loss of consciousness with interruption of awareness of oneself and ones surroundings. When the loss of consciousness is temporary and there is spontaneous ...
Substances such as dinitrophenol that allow oxidation in mitochondria to proceed without the usual concomitant phosphorylation to produce ATP; these poisons thus “uncouple” ...
Pertaining to or affecting the uncinate process of a vertebra.
The action of anointing or rubbing with an ointment or oil. [L. unctio, fr. ungo, pp. unctus, to anoint]
Greasy or oily. [L. unctuosus, fr. unctio, unction]
1. Any hook-shaped process or structure. 2. The anterior, hooked extremity of the parahippocampal gyrus on the basomedial surface of the temporal lobe; the anterior face of the ...
An acid present in small amounts in sweat; used with its zinc salt in ointments, or as a powder in the treatment of fungus diseases of the skin, psoriasis, and certain other ...
Failure to achieve as well as one's abilities would seem to allow.
A nontechnical term applied to mandibular underdevelopment or to excessive maxillary development.
1. That portion of a tooth that lies between the survey line (height of contour) and the gingivae. 2. The contour of a cross-section of a residual ridge or dental arch which ...
Electrical stimulation of the heart at a rate lower than that of an existing tachycardia; designed to capture the heart between beats, i.e., to interrupt a reentry pathway in ...
A form of malnutrition resulting from a reduced supply of food or from inability to digest, assimilate, and utilize the necessary nutrients.
Non-sensing of the intracardiac atrial or ventricular depolarization signal by a pacemaker.
A temporary decrease below the final steady-state value that may occur immediately following the removal of an influence that had been raising that value, i.e., overshoot in a ...
The effect of negative supercoiling on a structure of DNA.
Not differentiated; e.g., primitive, embryonic, immature, or having no special structure or function.
A small glass flask that was used in irrigation of the conjunctiva. [Mod. L. undina, fr. L. unda, wave]
Surgical restoration of continuity in any organ system, the flow through which had previously been diverted; e.g., between the upper urinary tract and bladder after supravesical ...
In psychology and psychiatry, an unconscious defense mechanism by which one symbolically acts out in reverse some earlier unacceptable behavior.
An infectious disease due to the bacteria Brucella that characteristically causes rising and falling fevers, sweats, malaise, weakness, anorexia, headache, myalgia (muscle ...
Having a wavy border or form. Also, rising and falling like a wave. For example, the border of a wound may be undulant, as may the edge of a rash. And sound waves may also be ...
To have a wavy border or form. Also, to rise and fall like a wave. For example, the border of a wound may undulate, as may the edge of a rash. And sound waves may undulate. The ...
Relating to a nail or the nails. SYN: unguinal. [L. unguis, nail]
SYN: ointment. [L. unguentum]
A division of Mammalia including all mammals having nails or claws, as distinguished from the Ungulata. [L. unguiculus, nail or claw]
Having nails or claws, as distinguished from hooves.
A small nail or claw. [L. dim. of unguis, nail]
SYN: nail (1). [L.]
- u. aduncus SYN: ingrown nail.
- u. avis SYN: calcarine spur.
- Haller u. SYN: calcarine spur.
- u. incarnatus SYN: ingrown nail.
A division of Mammalia containing the mammals with hooves, as distinguished from the Unguiculata.
Having hooves. [L. ungulatus, fr. ungula, hoof]
Walking on hooves, as by horses, pigs, and ruminants. [L. ungula, a hoof, + gradus, a step]
One, single, not paired; corresponds to G. mono-. [L. unus]
Having but one axis; growing chiefly in one direction.
A protein stain used in electrophoresis.
Composed of but one cell, as in the protozoons; for such u. organisms capable of undertaking life processes independently of other cells, the term acellular is also used.
Having a single center, as of growth or of ossification.
Having one horn, or cornu. SYN: unicorn. [L. unicornis, fr. uni- + cornu, horn]
Having one horn or being horn-shaped. The uterus is normally unicornuate.
Relating to or occurring in a single family; denoting especially a nervous disease attacking several of the children in the same family in which no hereditary trait is apparent.
Having but one foramen, pore, or opening of any kind.
1. Having but one form; not variable in form. 2. Of the same form or shape as another structure or object. [L. uniformis, fr. uni- + forma, form]
Relating to a single germ or ovum, e.g., monozygotic. SYN: monogerminal, monozygotic, monozygous.
Involving, relating to, or containing but one gland.
Strictly, denoting a trait in which the genetic component is contributed exclusively by one locus; in practice, any trait in which the contribution from one locus is so large that ...
Having but one compartment or cavity, as in a fat cell. [ uni- + L. loculus, compartment]
Denoting a single molecule. SEE ALSO: molecularity. SYN: monomolecular (1).
1. Relating to one eye only. 2. Having vision in only one eye.
1. Joining or amalgamation of two or more bodies. 2. Structural adhesion or growing together of the edges of a wound. 3. Healing of a fracture represented by the development of ...
1) Having produced only one offspring. Also called primiparous. 2) Producing only one offspring at a time. See also multiparous.
semipennate. [ uni- + L. penna, feather]
1. Having but one pole; denoting a nerve cell from which the branches project from one side only. 2. Situated at one extremity only of a cell.
Transport of a molecule or ion through a membrane by a carrier mechanism (uniporter), without known coupling to any other molecule or ion transport. Cf.:antiport, symport. [ ...
A protein that mediates the transport of one molecule or ion through a membrane without known coupling to the transport of any other molecule or ion.
Referring to those cells that produce a single type of daughter cell; e.g., a u. stem cell. Cf.:pluripotent cells, under cell.
1. One; a single person or thing. 2. A standard of measure, weight, or any other quality, by multiplications or fractions of which a scale or system is formed. 3. A group of ...
Unit, international (IU)
An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and ...
United Network for Organ Sharing (UNOS)
The nationwide umbrella for transplantation organ sharing in the U.S. UNOS states that it is "a private, not-for-profit, membership corporation qualified as a charitable ...
United States Adopted Names
Designation for nonproprietary name s (for drugs) adopted by the USAN Council in cooperation with the manufacturers concerned; the designation USAN is applicable only to ...
United States Public Health Service
The agency responsible for the public health of the American people. The Public Health Service (PHS) administers a number of critically important health agencies including the ...
(in full, Universal Blood and Body Fluid Precautions). A set of procedural directives and guidelines published in August 1987 by the Centers for Disease Control and Prevention ...
Denoting nerve fibers (axons) lacking a myelin sheath. SYN: amyelinated, amyelinic, nonmedullated, nonmyelinated, unmedullated.
Paul G., German dermatologist and staining expert, 1850–1929. See U. disease, U. nevus, U. stain, U.- Pappenheim stain, U.- Taenzer stain, U.-Thost syndrome.
Denoting a drug that is not listed in the United States Pharmacopeia or the National Formulary.
Acronym for the United Network for Organ Sharing, the nationwide umbrella for transplantation organ sharing in the U.S. UNOS states that it is "a private, not-for-profit, ...
Pertaining to conditions in the organism which are abnormal; can be used to refer to subjecting the body to abnormal amounts of substances normally present.
1. Not saturated; denoting a solution in which the solvent is capable of dissolving more of the solute. 2. Denoting a chemical compound in which all the affinities are not ...
To castrate; to deprive of the gonads.
A type of diabetes when a person's blood glucose (sugar) level often swings quickly from high to low and from low to high. Also called "brittle diabetes" or " labile diabetes."
Loss of one’s equilibrium in regard to the environment, often with a feeling of almost falling, or the result of bumping into things. There are many causes for unsteadiness, ...
Without striations; not striped; denoting the structure of the smooth or involuntary muscles.
In animals, denoting a failure to grow or develop normally as a result of disease.
Heinrich, German physician, 1853–1912. See U. disease.
Not well or in good health, ailing, sick, indisposed. For example, "I am well-nigh choked with the sulfurous heat of the weather — or I am unwell." (1826, Journal of Sir Walter ...
Abbreviation for ureteropelvic junction.
Upper GI series
: A series of x-rays of the esophagus, stomach, and small intestine (upper gastrointestinal, or GI, tract) that are taken after the patient drinks a barium solution. (Barium is a ...
The upper leg is the superior (top) segment of the leg: the part above the knee. As compared to the lower leg which boasts two bones (the tibia and the fibula), the upper leg has ...
Upper respiratory infection
An infection of the upper part of the respiratory system which is above the lungs. An upper respiratory infection can be due to any number of viral or bacterial infections. These ...
The 20th letter of the Greek alphabet, Ψ.
Refers to nucleic acid base sequences proceeding the opposite direction from expression.
The absorption by a tissue of some substance, food material, mineral, etc., and its permanent or temporary retention.
A rarely used term for primitive defenses. [Ger. ur-, primitive, earliest, + defenses]
Abbreviation for uracil.
A canal connecting the bladder of the fetus with the allantois, a structure that contributes to the formation of the umbilical cord. The lumen (inside) of the urachus is ...
2,4-Dioxopyrimidine; a pyrimidine (base) present in ribonucleic acid.
- u. dehydrogenase an oxidoreductase catalyzing oxidation of u. to barbituric acid; also oxidizes ...
A nucleotide base and one member of the A-U (adenine-uracil) base pair in RNA. The other base pair in RNA is G-C (guanine-cytosine). Uracil takes the place in RNA that thymine ...
A genus of tropical plants (family Rubiaceae). U. ipecacuanha (Cephaelis ipecacuanha) is the source of Rio or Brazilian ipecac; U. acuminata (C. acuminata) is the source of ...
SYN: fluorescein sodium.
SYN: palate. [G. ouraniskos, roof of the mouth, dim. of ouranos, sky]
A radioactive metallic element, atomic no. 92, atomic wt. 238.0289, occurring mainly in pitchblende and notable for its two isotopes: 238U and 235U (99.2745% and 0.720%, ...
The hard palate. [G. ouranos, sky vault, ouraniskos, roof of mouth (palate)]
SYN: palatorrhaphy. [urano- + G. rhaphe, suture]
Cleft of the hard palate. SYN: uraniscochasm. [urano- + G. schisis, fissure]
Repair of a cleft of both hard and soft palates. SYN: uranostaphylorrhaphy. [urano- + G. staphyle, uvula, + plasso, to form]
Cleft of the soft and hard palates. SYN: uranoveloschisis. [urano- + G. staphyle, uvula, + schisis, fissure]
The ion, UO22+, usually found in such salts as u. nitrate, UO2(NO3)2; u. acetate, UO2(CH3COO)2, is used in electron microscopy.
An antihypertensive agent which acts by influencing serotonin receptors.
An obsolete term to describe a spicy, aromatic odor of the urine. [G. ouron, urine, + aroma, spice]
Gouty inflammation of a joint. [urate + arthritis]
A salt derived from uric acid. When the body cannot metabolize uric acid properly, urates can build up in body tissues or crystallize within the joints. See also gout, uric ...
The presence of urates, especially sodium urate, in the blood. [urate + G. haima, blood]
Pertaining to a urate or to urates.
The decomposition or solution of urates. [urate + G. lysis, solution]
Causing the decomposition, or solution and removal of urates, from the tissues.
SYN: gouty tophus. [urate + G. -oma, tumor]
Any morbid condition due to the presence of urates in the blood or tissues.
The passage of an increased amount of urates in the urine. [urate + G. ouron, urine]
Erich, U.S. dermatologist, 1893–1946. See U.-Wiethe disease.
Jerome A., U.S. surgeon, *1914. See U. operation.
Urban typhus of Malaya
Murine typhus, an acute infectious disease with fever, headache, and rash, all quite similar to, but milder than, epidemic typhus. It is caused by a related microorganism, ...
Pitcher-shaped. SYN: urceolate. [L. urceus, pitcher, + forma, form]
SYN: urceiform. [L. urceolus, dim. of urceus, pitcher]
Abbreviation for uridine.
A nitrogen-containing substance normally cleared from the blood by the kidney into the urine. Diseases that compromise the function of the kidney often lead to increased blood ...
Urea breath test (UBT)
The urea breath test (UBT) is a procedure for diagnosing the presence of a bacterium, Helicobacter pylori (H. pylori) that causes inflammation, ulcers, and atrophy of the ...
Formation of urea, usually referring to the metabolism of amino acid s to urea. SYN: ureapoiesis. [urea + G. genesis, production]
Relating to or containing urea. SYN: ureic.
A genus of microaerophilic to anaerobic, nonmotile bacteria (family Mycoplasmataceae) with no cell walls. Gram-negative, they are predominantly coccoidal to coccobacillary ...
SYN: ureagenesis. [urea + G. poiesis, a making]
An enzyme that catalyzes the hydrolysis of urea to carbon dioxide and ammonia; used as an antitumor enzyme; it is present in intestinal bacteria and accounts for most of the ...
Edema due to infiltration of urine into the subcutaneous tissues. [G. ouron, urine, + oidema, swelling]
Any compound of urea in which one or more of its hydrogen atoms have been substituted by acid radicals.