Copy of `Dorland's Medical Dictionary`

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Dorland's Medical Dictionary Category: Health and Medicine > Medical Dictionary Date & country: 31/12/2010, USA Words: 39128

tricephalus
(tri-sef´ә-lәs) a malformed fetus with three heads.

triceps
(tri´seps) a muscle having three heads.

triceps brachii muscle
triceps muscle of arm (3 heads): origin,LONG HEAD—infraglenoid tubercle of scapula, LATERAL HEAD—posterior surface of humerus, lateral border of humerus, lateral intermuscular septum, MEDIAL HEAD—posterior surface of humerus below radial groove, medial border of humerus, medial intermuscular septum; insertion, olecr...

triceps crutch
a crutch consisting of two uprights extending halfway between the elbow and shoulder, with a cross piece for the hand and a curved upper arm part against which the subject leans the upper arm.

triceps reflex
contraction of the belly of the triceps muscle and slight extension of the upper limb when the tendon of the muscle is tapped directly, with the limb flexed and fully supported and relaxed.

triceps surae jerk
ankle jerk.

triceps surae muscle
the gastrocnemius and soleus muscles considered together.

triceps surae reflex
ankle jerk.

trichiasis
(trĭ-ki´ә-sis) a condition of ingrowing hairs about an orifice. inversion of the eyelashes, characterized by excessive tearing and the sensation of a foreign body in the eye. the appearance of hairlike filaments in the urine.

trichilemmal
(trik″ĭ-lem´әl) pertaining to the outer root sheath.

trichilemmoma
(trik″ĭ-lәm-o´mә) a benign adnexal tumor of the lower outer root sheath of the hair.

trichina
(trĭ-ki´nә) an individual roundworm of the genus Trichinella.

Trichinella
(trik″ĭ-nel´ә) a genus of parasitic nematodes (roundworms). T. spira´lis is a species found in the striated muscle of various animals, and causes trichinosis in humans who eat poorly cooked pork.

trichinosis
(trik″ĭ-no´sis) infection with the parasitic roundworm Trichinella spiralis, whose larvae live embedded in tiny capsulelike cysts of muscle tissue of infected pork. When the meat is properly cooked, the larvae are killed by the high temperature; however, in undercooked meat they survive. When such meat is eat...

trichinous
(trik´ĭ-nәs) affected with or containing trichinae.

trichlorfon
(tri-klor´fon) metrifonate.

trichlormethiazide
(tri-klor″mә-thi´ә-zīd) a thiazide diuretic used as an antihypertensive agent and for treatment of edema.

trichloroacetic acid
(tri-klor″o-ә-se´tik) a strong acid used as a protein precipitant in clinical chemistry and also as a caustic in chemabrasion and for removing warts.

trichloroethylene
(tri-klor″o-eth´ә-lēn) a widely used industrial solvent, formerly used as an inhalation analgesic and anesthetic; exposure to high vapor concentrations can cause fatal poisoning.

trichlorphon
(tri-klor´fon) metrifonate.

trichoadenoma
(trik″o-ad″ә-no´mә) a type of benign adnexal tumor on the face or trunk, with features in between those of trichofolliculoma and trichoepithelioma, having large cystic spaces lined by squamous epithelium and squamous cells.

trichobezoar
(trik″o-be´zor) a bezoar composed of hair; hairball.

trichoblastoma
(trik″o-blas-to´mә) any of a large group of benign adnexal tumors that differentiate toward hair germ epithelium. See also trichoepithelioma.

trichocardia
(trik″o-kahr´de-ә) a hairy appearance of the heart due to exudative pericarditis.

trichodiscoma
(trik″o-dis-ko´mә) a benign adnexal tumor arising from the mesodermal portion of the hair disk, now thought to be a variety of fibrofolliculoma.

trichoepithelioma
(trik″o-ep″ĭ-the-le-o´mә) a benign adnexal tumor originating in the hair follicles, usually of the face; it may occur as an inherited condition with multiple tumors (multiple trichoepithelioma) or as a solitary, nonhereditary lesion (solitary trichoepithelioma). Some authorities consider this to be a su...

trichoesthesia
(trik″o-es-the´zhә) sensibility of the hair to touch.

trichofolliculoma
(trik″o-fә-lik″u-lo´mә) a type of benign adnexal tumor, a hamartoma of the hair follicle, usually solitary, dome-shaped, nodular, located on the head or neck, and having a central pore that contains a hairlike tuft.

trichoglossia
(trik″o-glos´e-ә) hairy tongue.

trichoid
(trik´oid) resembling hair.

trichology
(trĭ-kol´ә-je) the sum of knowledge about the hair.

trichome
(tri´kōm) a filamentous or hairlike structure.

trichomonad
(trik″o-mo´nad) (trik″o-mon´ad) a parasite of the genus Trichomonas.

Trichomonas
(trik″o-mo´nәs) a genus of flagellate protozoa parasitic in birds and mammals, including humans. T. ho´minis and T. te´nax are nonpathogenic species found in the human mouth and intestines. T. vagina´lis is found in the vagina and male genital tract and is the cause of trichomoniasis.

trichomoniasis
(trik″o-mo-ni´ә-sis) infection by protozoa of the species Trichomonas. In humans this is usually a sexually transmitted disease caused by T. vaginalis. In females, vaginal or urethral infections may be symptom-free or may produce itching or burning, dysuria, and green, yellow, or a white vaginal or urethral ...

trichomycosis
(trik″o-mi-ko´sis) any disease of the hair caused by fungi. trichomycosis axillaris infection of underarm and sometimes pubic hair, due to Corynebacterium tenuis (now known not to be a fungus); variably colored, nodulelike clumps of bacteria develop on the hairs.

trichonodosis
(trik″o-no-do´sis) a condition characterized by apparent or actual knotting of the hair.

trichopathy
(trĭ-kop´ә-the) trichosis.

trichophagia
(trik″o-fa´jә) the habit of eating hair, a form of pica.

trichophytic granuloma
a form of tinea corporis seen mainly on the lower legs, due to infection of hairs by the fungus Trichophyton; characteristics include raised, circumscribed, boggy granulomas that are disseminated or arranged in chains. Lesions are slowly absorbed or undergo necrosis, leaving depressed scars. Called also Majocchi granuloma.

trichophytin
(trĭ-kof´ĭ-tin) a filtrate from cultures of Trichophyton; used in testing for trichophytosis.

trichophytin test
an intradermal test sometimes used in diagnosing suspected cases of superficial infection of the skin with the fungus Trichophyton. Trichophytin prepared from cultures of the fungus is injected; if there is a fungal infection present, there will be a reaction similar to the tuberculin reaction.

trichophytobezoar
(trik″o-fi″to-be´zor) a bezoar composed of animal hair and vegetable fiber.

Trichophyton
(tri-kof´ĭ-ton) a genus of fungi that may cause various infections of the skin, hair, and nails.

trichophytosis
(trik″o-fi-to´sis) infection with fungi of the genus Trichophyton. adj., trichophyt´ic., adj.

trichoptilosis
(trik″o-tĭ-lo´sis) splitting of hairs at the end.

trichorhinophalangeal syndrome
an autosomal recessive syndrome consisting of sparse, slowly growing hair, pear-shaped nose with high philtrum, and brachyphalangia with deformity of the fingers and wedge-shaped epiphyses.

trichorrhexis
(trik″o-rek´sis) a condition in which the hairs break. trichorrhexis nodosa a hair condition in which the shafts appear to have nodes but actually have splitting of the cortex into strands; it usually affects the proximal part of the shaft, so that hairs grow a few centimet...

trichoschisis
(trik-os´kĭ-sis) trichoptilosis.

trichosis
(trĭ-ko´sis) any disease of the hair; called also trichopathy.

Trichosporon
(tri-kos´pә-ron) a genus of fungi that are normal flora of the respiratory and digestive tracts of humans and other animals, and may infect the hair.

trichosporosis
(trik″o-spә-ro´sis) infection with Trichosporon.

trichostasis spinulosa
(trĭ-kos´tә-sis spin″u-lo´sә) obstruction of the hair follicles with a spinulous dark plug, consisting of many lanugo hairs in a horny mass; it may affect the skin of the alae nasi and other facial areas, or of the arms, chest, abdomen, or interscapular area.

trichostrongyliasis
(trik″o-stron″jә-li´ә-sis) infection by species of Trichostrongylus; it may be asymptomatic or iconsist of diarrhea.

trichostrongylosis
(trik″o-stron″jә-lo´sis) trichostrongyliasis.

Trichostrongylus
(trik″o-stron´jә-lәs) a genus of nematode parasites found in the intestines of humans and other animals; see trichostrongyliasis.

trichothiodystrophy
(trik″o-thi″o-dis´trә-fe) a congenital disorder in which hair is sparse and brittle, has an unusually low sulfur content, and has a banded appearance under polarized light; ichthyotic skin and physical and mental retardation are also present. Several forms exist; in some of them photosensitivity ...

trichotillomania
(trik″o-til″o-ma´ne-ә) an impulse control disorder consisting of an irresistible compulsion to pull out one's hair, the act being preceded by tension or an irresistable urge and followed by pleasure or relief. The diagnosis excludes such activities when caused by physical factors or by delusions ...

trichotomous
(tri-kot´ә-mәs) divided into three parts.

trichroism
(tri´kro-iz-әm) the condition or quality of exhibiting three different colors when viewed from three different aspects. adj., trichro´ic., adj.

trichromacy
(tri-kro´mә-se) trichromatic vision. anomalous trichromacy anomalous trichromatic vision.

trichromatic
(tri″kro-mat´ik) having or pertaining to three different colors. able to distinguish the three primary colors; see trichromatic vision.

trichromatic vision
ability to see all three primary colors of light (red, green, and blue). normal color vision; called also trichromacy and trichromatism.

trichromatism
(tri-kro´mә-tiz-әm) trichromatic vision. anomalous trichromatism anomalous trichromatic vision.

trichromic
(tri-kro´mik) pertaining to or exhibiting three colors. trichromatic.

trichuriasis
(trik″u-ri´ә-sis) infection with species of Trichuris; in adults it may be asymptomatic, but in children it may cause vomiting, diarrhea, and rectal prolapse.

Trichuris
(trĭ-ku´ris) the whipworms, a genus of nematodes parasitic in the intestinal tract. T. trichiu´ra, the cause of trichuriasis in humans.

tricipital
(tri-sip´ĭ-tәl) three-headed. relating to the triceps muscle.

tricitrates
(tri-sit´rāts) a solution of sodium citrate, potassium citrate, and citric acid; used as a systemic or urinary alkalizer and neutralizing buffer and for prevention of kidney stones.

triclosan
(tri-klo´san) an antibacterial effective against gram-positive and most gram-negative organisms and exhibiting slight activity against yeasts and fungi; used as a detergent in surgical scrubs, soaps, and deodorants.

tricornute
(tri-kor´nūt) having three horns, cornua, or processes.

tricrotic pulse
one in which the tracing shows three marked expansions in one beat of the artery.

tricrotic wave
a third wave in the sphygmographic curve in addition to the tidal and dicrotic waves, occurring during systole.

tricrotism
(tri´kro-tiz-әm) the quality of having three sphygmographic waves or elevations to one beat of the pulse. adj., tricrot´ic., adj.

tricuspid
(tri-kus´pid) having three points or cusps, as a valve of the heart.

tricuspid atresia
absence of the tricuspid orifice, circulation being made possible by an atrial septal defect. Tricuspid atresia, here displaying a ventricular septal defect and normally related great arteries, the arrows showing the altered flow of blood through the heart.

tricuspid incompetence
tricuspid insufficiency.

tricuspid insufficiency
incomplete closure of the tricuspid valve, resulting in tricuspid regurgitation.

tricuspid murmur
a heart murmur caused by disease of the tricuspid valve; it may be either obstructive or regurgitant.

tricuspid orifice
the opening between the right atrium and the right ventricle of the heart, guarded by the tricuspid valve.

tricuspid regurgitation
backflow of blood from the right ventricle into the right atrium, owing to imperfect functioning (insufficiency) of the tricuspid valve.

tricuspid stenosis
(TS) narrowing or stricture of the tricuspid valve of the heart; this is often seen in patients with severe congestive heart failure, usually the result of volume overload and pulmonary hypertension with right ventricular and tricuspid annular dilation.

tricuspid valve
the cardiac valve guarding the opening between the right atrium and right ventricle.

tricyclic
(tri-sik´lik) (-si´klik) containing three fused rings or closed chains in the molecular structure; see also antidepressant.

tridactylism
(tri-dak´tә-liz-әm) the presence of only three digits on the hand or foot.

tridentate
(tri-den´tāt) having three prongs.

tridermic
(tri-dur´mik) derived from all three germ layers (ectoderm, endoderm, and mesoderm).

trientene
(tri´en-tēn) a chelating agent used as the hydrochloride salt for chelation of copper in treatment of Wilson disease, administered orally.

triethanolamine
(tri″eth-ә-nol´ә-mēn) trolamine.

trifacial neuralgia
trigeminal neuralgia tic douloureux.

trifascicular block
an imprecise term referring to heart block characterized by failure of conduction, partial or complete, in all three of the fascicles of the intraventricular conduction system, with simultaneous right bundle branch block, left anterior hemiblock, and left posterior hemiblock. If there is also acute anterior wall myocardia...

trifid
(tri´fid) split into three parts.

trifluoperazine
(tri-floo″o-per´ә-zēn) a phenothiazine derivative used in the form of the hydrochloride salt as an antipsychotic agent.

triflupromazine
(tri″floo-pro´mә-zēn) a phenothiazine derivative used in the form of the hydrochloride salt as an antipsychotic agent and antiemetic, administered intramuscularly or intravenously.

trifluridine
(tri-floor´ĭ-dēn) an antiviral compound that interferes with viral DNA synthesis, used topically in the treatment of keratitis and keratoconjunctivitis caused by human herpesviruses 1 and 2.

trifocal glasses
glasses with trifocal lenses.

trifocal lens
one having three segments of different refracting powers, the upper for distant, the middle for intermediate, and the lower for near vision.

trifurcation
(tri″fәr-ka´shәn) division into three branches or parts, such as blood vessels, or teeth that have three roots. the site of such division.

trigeminal
(tri-jem´ĭ-nәl) triple. pertaining to the fifth cranial nerve (trigeminal nerve). pertaining to trigeminy.

trigeminal ganglion
a ganglion on the sensory root of the fifth cranial nerve, situated in a cleft within the dura mater on the anterior surface of the pars petrosa of the temporal bone, and giving off the ophthalmic and maxillary and part of the mandibular nerve. Called also gasserian or semilunar ganglion.