In biologic classification, an occasionally used division between the family and the genus; often the same as the subfamily. [L. tribus]
The study of friction and its effects in biologic systems, especially in regard to articulated surfaces of the skeleton. [G. tribo, to rub, + logos, study]
Luminosity produced by friction. [G. tribo, to rub, + luminescence]
Condition seen in conjoined twins in which there are only three arms for the two bodies. See conjoined twins, under twin. [ tri- + G. brachion, arm]
A synthetic substrate for lipase assays. SYN: glyceryl tributyrate, tributyrylglycerol.
Acronym for trachoma and inclusion conjunctivitis. See T. agents, under agent.
Fetus with three heads. [ tri- + G. kephale, head]
The triceps muscle extends (straightens) the elbow. Its full name is the triceps brachii. It can be felt as the tense muscle in the back of the upper arm while doing push-ups. ...
Pain produced by touching the hair; painful hair, as can occur with atypical angina. SYN: trichodynia. [ trich- + G. algos, pain]
SYN: telangion. [ trich- + G. angeion, vessel]
Atrophy of the hair bulbs, with brittleness, splitting, and falling out of hair. [ trich- + G. atrophia, atrophy]
Excessive growth of hair in length and quantity. [ trich- + G. auxis, increase]
A condition in which the hair adjacent to a natural orifice turns inward and causes irritation; e.g., in inversion of an eyelid (entropion), eyelashes irritate the eye. SYN: ...
A benign tumor derived from outer root sheath epithelium of a hair follicle, consisting of cells with pale-staining cytoplasm containing glycogen; multiple trichilemmomas are ...
Old name for a genus of nematode worms, correctly called Trichinella.
A larval worm of the genus Trichinella; the infective form in pork. [Mod. L., fr. G. thrix (trich-), a hair]
is a parasitic worm that lives in the intestines and causes a serious illness known as trichinosis. The eggs usually enter the body via raw or undercooked pork, sausage or bear ...
A nematode genus in the aphasmid group that causes trichinosis in humans and carnivores. [Mod. L. fr. trichina + dim. suffix ella]
- T. pseudospiralis. nematode species with ...
The worm that causes trichinosis. Trichinella spiralis larvae can infest pigs and wild game, hibernating in muscle tissue within a protective cyst. Trichinosis can be ...
A superfamily of nematodes, including the following roundworms that are parasitic in man: Trichinella spiralis, the trichina worm (family Trichinellidae); Trichuris trichiura, ...
A disease, also known as trichinosis, that comes from eating raw or undercooked pork or wild game that is infected with the larvae of a worm called Trichinella. The initial ...
A magnifying glass used in the examination of meat suspected of being trichinous. [ trichina + G. skopeo, to view]
A disease that comes from eating raw or undercooked pork or wild game that is infected with the larvae of a worm called Trichinella spiralis. The initial symptoms of the disease ...
A cephalometric point at the midpoint of the hairline at the top of the forehead. [G. thrix, hair]
An organophosphorus compound effective against immature and mature stages of Schistosoma haematobium, but ineffective against other species of Schistosoma in humans. SYN: ...
A chloride having three chlorine atoms in the molecule; e.g., PCl3.
Used as an astringent antiseptic in 1–5% solution or as an escharotic for venereal and other warts; a widely used protein precipitant.
An industrial solvent with pronounced inhalation anesthetic activity. SYN: methylchloroform.
A hypnotic and sedative; as a metabolite of chloral hydrate, it contributes to the depressant activity of chloral hydrate. SYN: trichloroethyl alcohol.
A possible carcinogenic (cancer-causing) compound used mainly as a degreaser for metal parts. Trichloroethylene was also at one time used to decaffeinate coffee. There are limited ...
A propellant used for aerosol sprays; has anesthetic and arrhythmogenic activity if inhaled in high concentration. SYN: trichloromonofluoromethane.
A wad of swallowed hair. Also called a hairball. Trichobezoars can sometimes be found to cause blockage of the digestive system, especially at the exit of the stomach. ...
Incorrect name for Trichuris. [tricho- + G. kephale, head]
Yellow-orange and violet natural pigments related to melanins; partly responsible for the red and auburn colors of human hair. [tricho- + G. chroma, color]
One of a number of structures, in the form of minute elongated cysts, arranged radially around the periphery of a protozoan cell and containing fluid which when discharged serves ...
A genus of biting lice that includes the species T. canis (T. latus), the biting louse of dogs that commonly serves as an intermediate host for the dog tapeworm, Dipylidium ...
A genus of fungi in soil that furnishes the antibiotic gliotoxin. Has produced rare opportunistic infections. [tricho- + G. derma, skin]
Dominantly inherited or nonfamilial elliptical parafollicular mesenchymal hamartomas.
SYN: trichalgia. [tricho- + G. odyne, pain]
Defective nutrition or growth of hair, often culminating in alopecia. May be acquired or congenital; the latter often with metabolic or other birth defects. [tricho- + G. prefix ...
Multiple small benign nodules, occurring mostly on the skin of the face, derived from basal cells of hair follicles enclosing small keratin cysts; autosomal dominant inheritance. ...
1. The sensation felt when a hair is touched. 2. A form of paresthesia in which there is a sensation as of a hair on the skin, on the mucous membrane of the mouth, or on the ...
A usually solitary tumor or hamartoma in which multiple abortive hair follicles open into a central cyst or space opening on the skin surface. [tricho- + L. folliculus, ...
An agent that promotes the growth of hair. [tricho- + G. -gen, producing]
A substance of the nature of keratohyalin found in the developing inner root sheath of the hair follicle.
Hairlike. [tricho- + G. eidos, resemblance]
A nervous habit of plucking at the hair. SYN: trichology (2). [G. trichologeo, to pluck hairs, fr. tricho- + lego, to pick out, gather]
1. The study of the anatomy, growth, and diseases of the hair. [tricho- + G. logos, study] 2. SYN: trichologia. [G. trichologeo, fr. tricho- + lego, to pick out]
SYN: trichiasis. [tricho- + G. -oma, tumor]
Congenital condition characterized by abnormally long eyelashes; associated with dwarfism. [tricho- + G. megas, large]
Common name for members of the family Trichomonadidae.
A family of protozoan flagellates that includes the genus Trichomonas.
A genus of parasitic protozoan flagellates ( subfamily Trichomonidinae, family Trichomonadidae) causing trichomoniasis in humans, other primates, and birds. Specificity is ...
Disease caused by infection with a species of protozoon of the genus Trichomonas or related genera.
- t. vaginitis acute vaginitis or urethritis caused by infection with ...
Term formerly used to mean any disease of the hair caused by a fungus; now synonymous with trichonocardiosis or t. axillaris. In present usage, t. is a misnomer because the ...
SYN: trichomycosis axillaris. [tricho- + L. nodus, node (swelling), + G. -osis, condition]
Excessive worry regarding disease of the hair, its color, or abnormalities of its growth. [tricho- + G. pathos, suffering, + phobos, fear]
Any disease of the hair. SYN: trichonosis, trichosis. [tricho- + G. pathos, suffering]
Habitual biting of the hair. [tricho- + G. phagein, to eat]
Morbid disgust caused by the sight of loose hairs on clothing or elsewhere. [tricho- + G. phobos, fear]
A mixed hair and food ball, consisting of vegetable fibers, seeds and skins of fruits, and animal hair matted together to form a ball in the stomach of humans or other animals, ...
A genus of pathogenic fungi causing dermatophytosis in humans and animals; species may be anthropophilic, zoophilic, or geophilic, and attack the hair, skin, and nails, and ...
Superficial fungus infection caused by species of Trichophyton. [tricho- + G. phyton, plant, + -osis, condition]
A genus of biting lice that infest ruminants, e.g., T. lipeuroides and T. parallelus in American deer; considered by some to be a subgenus of Damalinia. [tricho- + G. pleura, ...
SYN: poliosis. [tricho- + G. polios, gray, + -osis, condition]
An order of insects in which the aquatic larvae (caddis flies) construct a protective case (caddis) of bits of submerged material in a highly specific form; commonly found ...
A condition of splitting of the shaft of the hair, giving it a feathery appearance. [tricho- + G. ptilosis, plumage, + -osis, condition]
A condition in which the hairs tend to readily break or split. [tricho- + G. rhexis, a breaking]
- t. invaginata SYN: bamboo hair.
- t. nodosa a congenital or acquired condition ...
The presence of broken or split hairs. SEE ALSO: trichorrhexis. [tricho- + G. schisis, a cleaving]
SYN: trichopathy. [tricho- + G. -osis, condition]
- t. carunculae a growth of hair on the lacrimal caruncle.
- t. sensitiva hyperesthesia of the hairy parts.
- t. setosa ...
Having flagella with a small body; denoting certain protozoan organisms. See Trichomonas. [tricho- + G. soma, body]
A genus of imperfect fungi that possess branching septate hyphae with arthroconidia and blastoconidia; these organisms are part of the normal flora of the intestinal tract of ...
Systemic infection by Trichosporan beigelii; marked by fever or pneumonia with a high mortality; seen in neutropenic patients. Local infection with T. beigelii is white piedra, ...
Infection with Trichosporon beigelii. [Trichosporon + G. -osis, condition]
A condition in which hair follicles are blocked with a keratin plug containing multiple vellus hairs forming pruritic papules. [tricho- + G. stasis, a standing; L. spinulosus, ...
A family of nematodes (order Strongylida or, in older terminology, Strongylata); includes the important genera Cooperia, Ostertagia, Haemonchus, Trichostrongylus, Nematodirus, ...
The hairworm, or bankrupt or black scour worm; an economically important genus (about 30 species) of small slender nematodes (family Trichostrongylidae) that inhabit the small ...
A genus of imperfect fungi generally considered a common saprophyte.
Congenital brittle hair resulting from low sulfur-containing amino acid ( cysteine) content sometimes associated with mental impairment and short stature; autosomal recessive ...
A compulsion to pull out one's own hair. [tricho- + G. tillo, pull out, + mania, insanity]
A division into three parts. [G. trichia, threefold, + tome, a cutting]
A cytotoxin having an injurious effect specifically for ciliated epithelium.
Nutrition of the hair. [tricho- + G. trophe, nourishment]
Relating to or marked by trichroism.
The property of some crystals of emitting different colors in three different directions. [G. trichroos, three-colored, fr. tri- + chroa, color]
A person who sees three primary colors; hence, one with normal color vision. [ tri- + G. chroma, color]
1. Having, or relating to, the three primary colors: red, green, and blue. 2. Capable of perceiving the three primary colors; having normal color vision. SYN: trichromic.
The state of being trichromatic. [ tri- + G. chroma, color]
- anomalous t. a defect in color perception in which there appears to be an abnormality or deficiency in one of the ...
Normal color vision; the ability to perceive the three primary colors. [ tri- + G. chroma, color, + opsis, vision]
Infection with the human whipworm, a nematode (roundworm) formally known as Trichuris trichiura. The third most common round worm of humans. Occurs worldwide, with infections ...
A genus of aphasmid nematodes (sometimes improperly termed Trichocephalus) related to the trichina worm, Trichinella spiralis, and having a body with a slender, elongated, ...
A nematode (roundworm) also called the human whipworm. The third most common round worm of humans. Occurs worldwide, with infections more frequent in areas with tropical weather ...
Having three heads; denoting a triceps muscle.
A bisquaternary ammonium compound used topically in the treatment of superficial infections of the skin and vagina; a cationic antiseptic effective against both Gram-negative ...
A phosphorylated derivative of chloral hydrate, which is hydrolyzed to chloral hydrate in the body and produces characteristic sedative-hypnotic properties.
1. One of the lateral ventricles of the brain. 2. SYN: tricornute. [ tri- + L. cornu, horn]
Having three cornua or horns. SYN: tricorn (2). [ tri- + L. cornutus, horned, fr. cornu, a horn]
Thrice-beating; marked by three waves in the arterial pulse tracing. SYN: tricrotous. [ tri- + G. krotos, a beat]
A genus of operculate freshwater snails related to Oncomelania (the Schistosoma japonicum intermediate hosts) of the subfamily triculinae, family Hydrobiidae, subclass ...
Having three flaps or cusps. The valve that is called the tricuspid valve is situated between the right atrium and right ventricle and permits blood to flow only from the atrium ...
One of the four heart valves, the tricuspid valve is the first one that blood encounters as it enters the heart. The tricuspid valve stands between the right atrium and right ...
tricuspid, tricuspidal, tricuspidate
1. Having three points, prongs, or cusps, as the t. valve of the heart. 2. Having three tubercles or cusps, as the second upper molar tooth (occasionally) and the upper third ...
One of a class of medications used to treat depression. The tricyclic antidepressants are also used for some forms of anxiety, fibromyalgia, and the control of chronic pain. ...
Three-toothed; three-pronged. SYN: trident. [ tri- + L. dentatus, toothed]
Relating to or derived from the three primary germ layers of the embryo : ectoderm, endoderm, and mesoderm. [ tri- + G. derma, skin]
SYN: triphyllomatous teratoma. [ tri- + G. derma, skin, + -oma, tumor]
Having three fingers or three toes on one hand or foot. SYN: tridactylous. [ tri- + L. digitus, digit]
A form of silica used in dental casting investment. [fr. G. tridymos, threefold]
SYN: triplet (1). [L. fr. G. tridymos, threefold]
A long, three-jawed forceps for the extraction of foreign bodies from wounds or canals. [ tri- + G. helko, to draw]
A chelating agent used to remove excess copper from the body in Wilson disease. SYN: triethylenetetramine dihydrochloride.
A mixture of mono-, di-, and t., used as an emulsifying agent in the preparation of medicated ointments and lotions and as an aid in the absorption of such medicaments through ...
Used in the vapor state as an air-sterilizing agent; toxic to bacteria, fungi, and viruses in very low concentrations in air; variations in the humidity of the air limit the ...
An antineoplastic agent chemically related to the nitrogen mustards; used in the treatment of leukemia.
An alkylating agent used for the palliative treatment of malignant diseases such as leukemia, lymphoma, and carcinoma. SYN: thiotepa.
Denoting the fifth pair of cranial nerves, the trigeminal nerves. [ tri- + L. facies, face]
Split into three. [L. trifidus, three-cleft]
A group used to protect amino moieties of amino acid and peptides during peptide synthesis.
An antiviral agent used in eye drops to treat herpes simplex infections of the eye.
Having three foci. See t. lens.
1. A division into three branches. 2. The area where the tooth roots divide into three distinct portions. [ tri- + L. furca, fork]
Having three bellies; denoting a muscle with two tendinous interruptions. [ tri- + G. gaster, belly]
Relating to the fifth cranial or trigeminus nerve. SYN: trigeminus. [L. trigeminus, threefold]
The trigeminal nerve functions both as the chief nerve of sensation for the face and the motor nerve controlling the muscles of mastication (chewing). Problems with the sensory ...
SYN: trigeminal. [L. threefold, fr. tri- + geminus, twin]
SYN: trigeminal rhythm. [L. trigeminus, threefold]
Term describing a system in which a relatively small input turns on a relatively large output, the magnitude of which is unrelated to the magnitude of the input.
- ECG t. use ...
A simple blood test to measure the level of triglycerides in the blood. Triglyceride levels are influenced by recent fat and alcohol intake, so you should fast from food for at ...
Triangular; relating to a trigonum.
1. SYN: trigonum. 2. The first three dominant cusps ( protocone, paracone, and metacone), taken collectively, of an upper molar tooth. [L. trigonum, fr. G. trigonon, ...
The methyl betaine of nicotinic acid; a product of the metabolism of nicotinic acid; excreted in the urine. SYN: caffearine, trigenolline.
The first three dominant cusps, taken collectively, of a lower molar tooth. SEE ALSO: trigone.
Inflammation of the urinary bladder, localized in the trigone. [ trigone + G. -itis, inflammation]
Malformation characterized by a triangular configuration of the skull, due in part to premature synostosis of the cranial bones with compression of the cerebral hemispheres. [ ...
Any triangular area. See triangle. SYN: trigone (1) [TA]. [L., fr. G. trigonon, a triangle]
- t. auscultationis [TA] SYN: ausculatory triangle.
- t. caroticum [TA] SYN: ...
A synthetic anticholinergic agent reputed to exert a higher degree of anticholinergic activity in the brain as compared with peripheral parasympathetic neuroeffector junctions. ...
The offspring of parents that differ in three mendelian characters. [ tri- + L. hybrida, hybrid]
Denoting a chemical compound containing three replaceable hydrogen atoms.
A grossly malformed fetus with three heads, joined at the occiput, and a single body. [ tri- + G. inion, nape of the neck, + didymos, twin]
An iodide with three atoms of iodine in the molecule; e.g., KI3.
A three-pronged forceps for removal of foreign bodies from the bladder. [ tri- + G. labe, a handle, hold]
A triad of related entities. [G. trilogia, fr. tri- + logos, study, discourse]
- t. of Fallot a set of congenital defects including pulmonic stenosis, atrial septal defect, ...
An adrenal steroid inhibitor used for amelioration of adrenal hyperfunction in Cushing syndrome.
Having three flagella, as observed in certain protozoan organisms. [ tri- + G. mastix, whip]
A phenothiazine compound related chemically and pharmacologically to promazine but with a more pronounced histamine-antagonizing action; used for the symptomatic relief of ...
A compound, complex, or structure made up of three components.
The nine months of pregnancy is traditionally divided into three trimesters: distinct periods of roughly three months in which different phases of fetal development take place. ...
An obsolescent anticonvulsant used for the treatment of absence seizures (petit mal) and psychomotor epilepsy. SYN: troxidone.
A ganglionic blocking agent that produces vasodilation of brief duration; used in surgery, particularly neurosurgery, to produce a relatively bloodless operative field ...
Quaternary ammonium compound that blocks ganglionic transmission at sympathetic and parasympathetic ganglia; used in the treatment of severe hypertension.
An antimicrobial agent that potentiates the effect of sulfonamides and sulfones; usually used in combination with sulfamethoxazole.
A drug combination consisting of a dihydrofolate reductase inhibitor ( trimethoprim) and a sulfonamide antibacterial drug (sulfamethoxazole). The drug combination is ...
A degradation product, often by putrefaction, of nitrogenous plant and animal substances such as beet sugar residue or herring brine; in the body, it probably results from ...
Increased excretion of trimethylamine in urine and sweat, with characteristic offensive fishy body odor.
An inborn error of metabolism associated with an offensive body odor, the smell of rotting fish, due to the excessive excretion of TMA in urine, sweat, and breath. Persons with ...
An antineoplastic agent and antiprotozoal orphan drug used in the treatment of Pneumocystis carinii pneumonia in AIDS patients.
Existence under three forms, as in holometabolous insects that pass through larval, pupal, and imago stages. [ tri- + G. morphe, form]
Existing under three forms; marked by trimorphism. SYN: trimorphic.
A constituent of soluble guncotton; used in the preparation of collodion and of pyroxylin.
An explosive made by the nitrification of toluene; it causes gastric and intestinal disturbances and dermatitis in workers in munition factories. SYN: trinitrotoluol.
A combination of three adjacent nucleotides, free or in a polynucleotide or nucleic acid molecule; often used with specific reference to the unit ( codon or anticodon) ...
A phosphotransferase catalyzing the phosphorylation of d-glyceraldehyde by ATP to produce d-glyceraldehyde 3-phosphate and ADP; participates in a step in d-fructose metabolism. ...
A compound containing three hydroxyl groups; E.G., glycerol.
Conjoined twins with union in the facial region such that there is a common eye on the joined sides; a variety of opodidymus. See conjoined twins, under twin. [ tri- + G. ...
A triaryl phosphate; produces a delayed neurotoxicity. An infamous incident occurred when it appeared as an adulterant in Jamaica ginger and was responsible for thousands of ...
A three-carbon monosaccharide; e.g., glyceraldehyde and dihydroxyacetone.
An isomerizing enzyme that catalyzes the reversible interconversion of d-glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, a reaction of importance in glycolysis and ...
Diprosopus in which three ears are present. [ tri- + G. ous, ear]
A molecule containing three atoms of oxygen. SYN: teroxide.
An orally effective pigmenting, photosensitizing agent; used as a tanning agent and in the treatment of vitiligo.
Formerly used as inhibitor of cholesterol biosynthesis but withdrawn from the market because it promoted the formation of cataracts.
An antihistamine. Also available, with the same actions, is t. citrate; it is less bitter than the hydrochloride salt, and is therefore used in elixir.
A class of enzymes of different specificities that catalyzes the hydrolysis of tripeptides, producing a dipeptide and an amino acid.
A compound containing three amino acid s linked together by peptide bonds.
Malformation in which three phalanges are present in the thumb or great toe. [ tri- + phalanx]
Léon, French surgeon, 1842–1891. See T. amputation.
1. Paralysis of three limbs, both extremities on one side and one on the other. 2. Paralysis of an upper and a lower extremity and of the face. [ tri- + G. plege, stroke]
1. One of three children delivered at the same birth. SYN: tridymus. 2. A set of three similar objects, as a compound lens in a microscope, formed of three planoconvex lenses. ...
Formed of three primary germ layers (ectoderm, mesoderm, endoderm), or containing tissue derived from all three layers. [G. triploos, threefold, + blastos, germ]
Pertaining to or characteristic of triploidy. [ tri- + -ploid]
The presence of three haploid sets of chromosomes, instead of two, in all cells; results in fetal or neonatal death.
Abbreviation for t.(hydroxymethyl)aminomethane and t.(hydroxymethyl)methylamine; used as a trivial name.