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tribal
—tribally, adv. /truy"beuhl/, adj. of, pertaining to, or characteristic of a tribe: tribal customs. [1625-35; TRIBE + -AL1] * * *
tribalism
—tribalist, n. —tribalistic, adj. /truy"beuh liz'euhm/, n. 1. the customs and beliefs of tribal life and society. 2. strong loyalty to one's own tribe, party, or ...
tribalist
See tribalism. * * *
tribalistic
See tribalist. * * *
Triballi
▪ people       a Thracian people whose earliest known home was the “Triballian plain” (probably the Plain of Kosovo), near the junction of the Angrus and Brongus ...
tribally
See tribal. * * *
tribasic
—tribasicity /truy'bay sis"i tee/, n. /truy bay"sik/, adj. Chem. 1. (of an acid) having three atoms of hydrogen replaceable by basic atoms or groups. 2. containing three atoms ...
tribasic sodium phosphate.
See sodium phosphate (def. 3). * * *
tribe
/truyb/, n. 1. any aggregate of people united by ties of descent from a common ancestor, community of customs and traditions, adherence to the same leaders, etc. 2. a local ...
TriBeCa
TriBeCa [trī bek′ə] 〚tri angle be low Ca nal (street in Manhattan)〛 in Manhattan, the area between Broadway and the Hudson River south of Greenwich Village: noted as a ...
tribelet
/truyb"lit/, n. a tribe having few members, esp. one that is a component of a larger tribal organization. [1850-55; TRIBE + -LET] * * *
tribes
➡ Native American * * *
tribesman
/truybz"meuhn/, n., pl. tribesmen. a member of a tribe. [1790-1800; TRIBE + 's1 + -MAN] * * *
tribespeople
/truybz"pee'peuhl/, n. pl. the members of a tribe. [1885-90; TRIBE + 'S1 + PEOPLE] * * *
tribeswoman
tribes·wom·an (trībzʹwo͝om'ən) n. 1. A woman who is a member of one's own tribe. 2. A woman who is a member of an aboriginal people living in tribes. * * *
tribo-
a combining form meaning "friction," used in the formation of compound words: triboelectricity. [comb. form repr. Gk tríbein to rub; see -O-] * * *
triboelectric
See triboelectricity. * * *
triboelectricity
—triboelectric /truy'boh i lek"trik, trib'oh-/, adj. /truy'boh i lek tris"i tee, -ee'lek-, trib'oh-/, n. Elect. electricity generated by friction. [1915-20; TRIBO- + ...
tribological
See tribology. * * *
tribological ceramics
Introduction also called  wear-resistant ceramics        ceramic materials that are resistant to friction and wear. They are employed in a variety of industrial and ...
tribologist
See tribological. * * *
tribology
—tribologist, n. /truy bol"euh jee, tri-/, n. the study of the effects of friction on moving machine parts and of methods, as lubrication, of obviating them. [1965-70; TRIBO- + ...
triboluminescence
—triboluminescent, adj. /truy'boh looh'meuh nes"euhns, trib'oh-/, n. Physics. luminescence produced by friction, usually within a crystalline substance. [1885-90; TRIBO- + ...
Tribonian
▪ Byzantine legal scholar Latin  Tribonianus  born c. AD 475, Pamphylia? died 545       legal authority and public official in the Byzantine Empire (eastern Roman ...
tribrach
—tribrachic, adj. —tribrachial, adj. /truy"brak, trib"rak/, n. Pros. a foot of three short syllables. [ < L tribrachys < Gk tríbrachys, equiv. to tri- TRI- + brachýs short; ...
tribromide
/truy broh"muyd/, n. Chem. a bromide containing three atoms of bromine. [TRI- + BROMIDE] * * *
tribromoacetaldehyde
/truy broh'moh as'i tal"deuh huyd'/, n. Pharm. bromal. [TRI- + BROMO- + ACETALDEHYDE] * * *
tribromoethanol
/truy broh'moh eth"euh nawl', -nol'/, n. Pharm. a white, crystalline powder, C2H3Br3O, used as a basal anesthetic. [TRI- + BROMO- + ETHANOL] * * *
tribulation
/trib'yeuh lay"sheuhn/, n. 1. grievous trouble; severe trial or suffering. 2. an instance of this; an affliction, trouble, etc. [1175-1225; ME < L tribulation- (s. of tribulatio) ...
tribunal
/truy byoohn"l, tri-/, n. 1. a court of justice. 2. a place or seat of judgment. 3. Also called tribune. a raised platform for the seats of magistrates, as in an ancient Roman ...
tribunary
See tribune1. * * *
tribunate
/trib"yeuh nit, -nayt', tri byooh"nit, -nayt/, n. 1. the office of tribune. 2. a body of tribunes. [1540-50; < L tribunatus the office of a tribune. See TRIBUNE1, -ATE3] * * *
tribune
tribune1 —tribuneship, n. —tribunitial, tribunicial /trib'yeuh nish"euhl/, adj. /trib"yoohn, tri byoohn"/, n. 1. a person who upholds or defends the rights of the people. 2. ...
tributary
—tributarily, adv. /trib"yeuh ter'ee/, n., pl. tributaries, adj. n. 1. a stream that flows to a larger stream or other body of water. 2. a person or nation that pays tribute in ...
tribute
/trib"yooht/, n. 1. a gift, testimonial, compliment, or the like, given as due or in acknowledgment of gratitude or esteem. 2. a stated sum or other valuable consideration paid ...
tributyl phosphate
▪ chemical compound       an organic liquid solvent used in the extraction of uranium and plutonium salts from reactor effluents, as a solvent for nitrocellulose and ...
tricalcium silicate
/truy kal"see euhm/, Chem. a component of cement, Ca3SiO5, also used in food to prevent caking. [TRI- + CALCIUM] * * *
tricameral
tricameral [trī kam′ər əl] n. made up of or having three legislative chambers [the tricameral Parliament of South Africa] * * * tri·cam·er·al ...
tricarboxylic
/truy kahr'bok sil"ik/, adj. Chem. pertaining to a molecule that contains three carboxyl groups. [1915-20; TRI- + CARBOXYLIC] * * *
tricarboxylic acid cycle
Biochem. See Krebs cycle. [1940-45] * * * or Krebs cycle or citric-acid cycle Last stage of the chemical processes by which living cells obtain energy from ...
tricarboxylicacid cycle
tricarboxylic acid cycle n. See Krebs cycle. * * *
tricarpellary
/truy kahr"peuh ler'ee/, adj. Bot. having three carpels. [1870-75; TRI- + CARPELLARY] * * *
trice
trice1 /truys/, n. a very short time; an instant: in a trice. [1400-50; late ME tryse; prob. special use of *trise a pull, tug, deriv. of trisen, to pull; see ...
tricentennial
/truy'sen ten"ee euhl/, adj. 1. pertaining to 300 years or a period of 300 years. 2. marking the completion of such a period: a tricentennial celebration. n. 3. a 300th ...
tricep
/truy"sep/, n. a triceps muscle, esp. the one at the back of the upper arm. [1990-95] * * *
triceps
/truy"seps/, n., pl. tricepses /-sep siz/, triceps. Anat. a muscle having three heads or points of origin, esp. the muscle on the back of the arm, the action of which straightens ...
triceps muscle
▪ anatomy  any muscle with three heads, or points of origin, particularly the large extensor along the back of the upper arm in humans. It originates just below the socket of ...
triceratops
/truy ser"euh tops'/, n. any of various dinosaurs of the genus Triceratops, of the late Cretaceous Period, having a bony crest on the neck, a long horn over each eye, and a ...
trich-
var. of tricho- before a vowel: trichuriasis. * * *
trichiasis
/tri kuy"euh sis/, n. Pathol. a condition in which the eyelashes grow inwardly. [1655-65; < LL < Gk trichíasis. See TRICH-, -IASIS] * * *
trichina
/tri kuy"neuh/, n., pl. trichinae /-nee/. a nematode, Trichinella spiralis, the adults of which live in the intestine and produce larvae that encyst in the muscle tissue, esp. in ...
trichinization
See trichinize. * * *
trichinize
—trichinization, n. /trik"euh nuyz'/, v.t., trichinized, trichinizing. Pathol. to infect with trichinae. Also, esp. Brit., trichinise. [1860-65; TRICHIN(A) + -IZE] * * *
Trichinopoly
/trik'euh nop"euh lee/, n. former name of Tiruchirapalli. * * *
trichinosis
/trik'euh noh"sis/, n. Pathol. a disease resulting from infestation with Trichinella spiralis, occurring in humans, caused by ingestion of infested, undercooked pork, and ...
trichinous
/trik"euh neuhs/, adj. Pathol. 1. pertaining to or of the nature of trichinosis. 2. infected with trichinae. [1855-60; TRICHIN(A) + -OUS] * * *
trichion
/trik"ee on'/, n., pl. trichia /trik"ee euh/, trichions. Physical Anthropol. the point of intersection of the normal hairline and the middle line of the forehead. [ < Gk ...
trichite
—trichitic /tri kit"ik/, adj. /trik"uyt/, n. Petrog. any of various minute, hairlike mineral bodies occurring in certain vitreous igneous rocks, esp. obsidian. [1865-70; < Gk ...
trichitic
See trichite. * * *
trichlorfon
/truy klawr"fon, -klohr"-/, n. Chem., Pharm. metrifonate. [1955-60; trichlor(o)- (see TRI-, CHLORO-) + (phos)phon(ic acid) (see PHOSPH-, -ONIC), components of the chemical name, ...
trichloride
/truy klawr"uyd, -id, -klohr"-/, n. Chem. a chloride having three atoms of chlorine, as ferric chloride, FeCl3. [1860-65; TRI- + CHLORIDE] * * *
trichloroacetaldehyde
/truy klawr'oh as'i tal"deuh huyd', -klohr'-/, n. Chem. chloral (def. 1). Also called trichloroacetic acid aldehyde. [TRI- + CHLORO-2 + ACETALDEHYDE] * * *
trichloroacetic acid
/truy klawr"oh euh see"tik, -set"ik, -klohr"-, -klawr'-, -klohr'-/, Chem. a toxic, deliquescent, and colorless crystalline compound, C2HCl3O2, soluble in water, alcohol, and ...
trichloroaceticacid
tri·chlo·ro·a·ce·tic acid (trī-klôr'ō-ə-sēʹtĭk, -klōr'-) n. A colorless, deliquescent, corrosive, crystalline compound, CCl3COOH, used as a herbicide and topically ...
trichloroethane
tri·chlo·ro·eth·ane (trī-klôr'ō-ĕthʹān', -klōr'-) n. Either of two colorless, nonflammable, isomeric compounds, C2H3Cl3, having a sweet odor, used as solvents for ...
trichloroethylene
/truy klawr'oh eth"euh leen', -klohr'-/, n. Chem. a colorless, poisonous liquid, C2HCl3, used chiefly as a degreasing agent for metals and as a solvent, esp. in dry cleaning, for ...
trichlorofluoromethane
/truy klawr'oh floor'oh meth"ayn, -flawr'-; truy klohr'oh floor'oh meth"ayn, -flohr'-/, n. Chem. chlorotrifluoromethane. [TRI- + CHLORO- + FLUORO- + METHANE] * * *
trichloromethane
/truy klawr'oh meth"ayn, -klohr'-/, n. Chem. chloroform (def. 1). [1910-15; TRI- + CHLORO-2 + METHANE] * * *
trichloromethyl chloroformate
/truy klawr'oh meth"euhl klawr'euh fawr"mit, -mayt; truy klohr'oh meth"euhl klohr'euh fawr"mit, -mayt/, Chem. diphosgene. [TRI- + CHLORO-2 + METHYL] * * *
trichloronitromethane
/truy klawr'oh nuy'troh meth"ayn, -klohr'-/, n. Chem. chloropicrin. [TRI- + CHLORO-2 + NITROMETHANE] * * *
trichlorophenoxyacetic acid
/truy klawr"oh feuh nok'see euh see"tik, -set"ik, -klohr"-, -klawr'-, -klohr'-/, Chem. a light-tan, water-insoluble solid, C8H5Cl3O3, used chiefly for killing weeds. Also called ...
tricho-
a combining form meaning "hair," used in the formation of compound words: trichocyst. Also, esp. before a vowel, trich-. [ < Gk tricho-, comb. form of thríx (gen. trichós)] * * ...
trichocyst
—trichocystic, adj. /trik"euh sist'/, n. Zool. an organ of offense and defense embedded in the outer cytoplasm of certain protozoans, consisting of a small elongated sac ...
trichocystic
See trichocyst. * * *
trichogramma
/trik'euh gram"euh/, n. any minute wasp of the genus Trichogramma, comprising a beneficial group of chalcidflies that parasitize the eggs of a variety of insect pests. [ < NL; ...
trichogrammatid
▪ insect       any of a group of tiny, parasitic chalcid wasps, particularly of the genus Trichogramma, in the order Hymenoptera. Adults of Trichogramma species are less ...
trichogyne
—trichogynial /trik'euh jin"ee euhl/, trichogynic, adj. /trik"euh juyn', -jin/, n. Bot., Mycol. a hairlike prolongation of a carpogonium, serving as a receptive organ for the ...
trichoid
/trik"oyd/, adj. resembling hair; hairlike. [1850-55; TRICH- + -OID] * * *
trichology
—trichologist, n. /tri kol"euh jee/, n. the science dealing with the study of the hair and its diseases. [1855-60; TRICHO- + -LOGY] * * *
trichome
—trichomic /tri kom"ik, -koh"mik/, adj. /trik"ohm, truy"kohm/, n. 1. Bot. an outgrowth from the epidermis of plants, as a hair. 2. a microorganism composed of many filamentous ...
trichomic
See trichome. * * *
trichomonad
—trichomonadal /trik'euh mon"euh dl, -moh"neuh-/, trichomonal /trik'euh mon"l, -mohn"l, tri kom"euh nl/, adj. /trik'euh mon"ad, -moh"nad/, n. any flagellate protozoan of the ...
trichomonadal
See trichomonad. * * *
trichomonal
See trichomonadal. * * *
trichomoniasis
/trik'euh meuh nuy"euh sis/, n. Pathol. 1. a sexually transmitted disease typically asymptomatic in men and resulting in vaginitis with a copious, frothy discharge and itching in ...
trichonotid
/trik'euh not"id/, n. 1. any fish of the family Trichonotidae, comprising the sand divers. adj. 2. belonging or pertaining to the family Trichonotidae. [ < NL Trichonotidae name ...
trichonymph
/trik"euh nimf'/, n. a flagellated protozoan of the genus Trichonympha that lives in the intestine of wood-eating termites, transforming the cellulose in the wood into soluble ...
Trichophyton
▪ fungi       a genus of fungi in order Onygenales (phylum Ascomycota, kingdom Fungi) that infects the skin, hair, and nails of humans and other animals. It is one of ...
trichopteran
/tri kop"teuhr euhn/, adj. 1. trichopterous. n. 2. Also, trichopteron. a trichopterous insect; caddisfly. [1835-45; < NL Trichopter(a) (see TRICHOPTEROUS) + -AN] * * *
trichopteron
/tri kop"teuh ron'/, n., pl. trichoptera /-teuhr euh/. trichopteran. * * *
trichopterous
/tri kop"teuhr euhs/, adj. belonging or pertaining to the insect order Trichoptera, comprising the caddisflies. [1810-20; < NL Trichopter(a) ( < Gk tricho- TRICHO- + -ptera, ...
trichosis
/tri koh"sis/, n. Pathol. any disease of the hair. [1685-95; TRICH- + -OSIS] * * *
trichostome
▪ protozoan  any ciliate protozoan of the holotrichous order Trichostomatida. Free-living forms are found in freshwater (e.g., Tillina), salt water (e.g., Woodruffia), and ...
trichothecene
/truy'keuh thee"sin/, n. any of a group of toxins derived from various imperfect fungi, as of the genera Fusarium and Trichothecium. [1970-75; < NL Trichothec(ium) genus name ...
trichotillomania
/trik'euh til'euh may"nee euh/, n. Psychiatry. a compulsion to pull out one's hair. [1900-05; TRICHO- + Gk tíll(ein) to pluck, pull out + -O- + -MANIA] * * *
trichotomous
See trichotomy. * * *
trichotomously
See trichotomous. * * *
trichotomy
—trichotomic /trik'euh tom"ik/, trichotomous, adj. —trichotomously, adv. /tri kot"euh mee/, n., pl. trichotomies. 1. division into three parts, classes, categories, etc. 2. ...
trichotomy property
Math. the property that for natural numbers a and b, either a is less than b, a equals b, or a is greater than b. Also called law of trichotomy, trichotomy law, trichotomy ...
trichroic
/truy kroh"ik/, adj. Crystall. manifesting trichroism. [1880-85; TRI- + -CHROIC] * * *
trichroism
/truy"kroh iz'euhm/, n. Crystall. pleochroism of a biaxial crystal such that it exhibits three different colors when viewed from three different directions under transmitted ...
trichromat
trichromat [trī′krō mat΄] n. 〚back-form.
trichromatic
/truy'kroh mat"ik, -kreuh-/, adj. 1. pertaining to the use or combination of three colors, as in printing or in color photography. 2. pertaining to, characterized by, or ...
trichromatism
/truy kroh"meuh tiz'euhm/, n. 1. the quality or condition of being trichromatic. 2. the use or combination of three colors, as in printing or photography. 3. Ophthalm. normal ...
trichuriasis
/trik'euh ruy"euh sis/, n. Pathol. intestinal infestation with the roundworm Trichuris trichiura, producing nausea, abdominal discomfort, and diarrhea, common in tropical areas ...
trick
—tricker, n. —trickingly, adv. /trik/, n. 1. a crafty or underhanded device, maneuver, stratagem, or the like, intended to deceive or cheat; artifice; ruse; wile. 2. an ...
trick cyclist
trick cyclist n. [Brit. Slang] a psychiatrist * * *
trick ending
an ending of a story or play, etc., that employs a surprise element or character to resolve the plot. * * *
trick knee
a condition of the knee in which the joint suddenly stiffens or abandons its support. * * *
trick or treat
a children's Halloween custom, in which they call on neighbors, using this phrase, and threaten to play a trick if a treat is not given. [1940-45] * * *
trick or treat!
☆ trick or treat! traditional greeting used by a TRICK-OR-TREATER: orig. used with the meaning “give me a treat or I will play a trick on you!” * * *
trick-or-treat
—trick-or-treater, n. /trik"euhr treet"/, v.i. to become involved or take part in trick or treat. [1940-45] * * *
trick-or-treater
☆ trick-or-treater [trik′ər trēt′ər ] n. 〚see TRICK OR TREAT!〛 a person, typically a child, who goes from door to door in costume on Halloween asking for candy or ...
trick-track
/trik"trak'/, n. a variety of backgammon. Also, trictrac. [1645-55; < F trictrac; so called in imitation of the clicking sound made in moving the pieces] * * *
tricker
See trick. * * *
trickery
/trik"euh ree/, n., pl. trickeries. 1. the use or practice of tricks or stratagems to deceive; artifice; deception. 2. a trick used to deceive. [1790-1800; TRICK + -ERY] Syn. 1. ...
Trickett, Lisbeth
▪ Australian swimmer née  Lisbeth Lenton  born Jan. 28, 1985, Townsville, Queens., Austl.       Australian swimmer who set several world records in the 100-m ...
trickily
See tricky. * * *
trickiness
See trickily. * * *
trickish
—trickishly, adv. —trickishness, n. /trik"ish/, adj. tricky. [1695-1705; TRICK + -ISH1] * * *
trickishly
See trickish. * * *
trickishness
See trickishly. * * *
trickle
—tricklingly, adv. /trik"euhl/, v., trickled, trickling, n. v.i. 1. to flow or fall by drops, or in a small, gentle stream: Tears trickled down her cheeks. 2. to come, go, or ...
trickle charge
Elect. a continuous, slow charge supplied to a storage battery to keep it in a fully charged state. [1955-60] * * *
trickle irrigation.
See drip irrigation. [1970-75] * * *
trickle-down
/trik"euhl down'/, adj. of, pertaining to, or based on the trickle-down theory: the trickle-down benefits to the local community. [1950-55; adj. use of v. phrase trickle down] * ...
trickle-down theory
an economic theory that monetary benefits directed esp. by the government to big business will in turn pass down to and profit smaller businesses and the general ...
trickle-up
trick·le-up (trĭkʹəl-ŭp') adj. Of or relating to the belief that financial benefits accorded to low-income people and very small businesses, as through microcredit or ...
tricklecharge
trickle charge n. An electric charge supplied to a storage battery at a continuous low rate to keep it fully charged. * * *
trickledown
☆ trickledown [trik′'ldoun΄ ] adj. designating or of an economic theory that holds that government policies that stimulate profits and growth among the largest businesses ...
trickor treat
trick or treat interj. Used as a greeting by children when trick-or-treating. * * *
tricksome
/trik"seuhm/, adj. 1. tricksy (def. 1). 2. tricky (def. 1). [1640-50; TRICK + -SOME1] * * *
trickster
—trickstering, n. /trik"steuhr/, n. 1. a deceiver; cheat; fraud. 2. a person who plays tricks. 3. a supernatural figure appearing in various guises and typically engaging in ...
trickster tale
In oral traditions worldwide, a story of deceit, magic, and violence perpetrated by a mythical animal-human (trickster). The trickster-hero is both creator god and innocent ...
tricksy
—tricksily, adv. —tricksiness, n. /trik"see/, adj., tricksier, tricksiest. 1. Also, tricksome. given to tricks; mischievous; playful; prankish. 2. difficult to handle or deal ...
tricky
—trickily, adv. —trickiness, n. /trik"ee/, adj., trickier, trickiest. 1. given to or characterized by deceitful tricks; crafty; wily. 2. skilled in clever tricks or ...
triclad
/truy"klad/, n. a planarian. [1885-90; < NL Tricladida name of the order of flatworms including planarians. See TRI-, CLAD-, -IDA] * * *
triclinic
/truy klin"ik/, adj. Crystall. noting or pertaining to a system of crystallization in which the three axes are unequal and intersect at oblique angles. Cf. crystal ...
triclinic system
▪ crystallography       one of the structural categories to which crystalline solids can be assigned. Crystals in this system are referred to three axes of unequal ...
triclinium
/truy klin"ee euhm/, n., pl. triclinia /-klin"ee euh/. Rom. Hist. 1. a couch extending along three sides of a table, for reclining on at meals. 2. a dining room, esp. one ...
Triclinius, Demetrius
▪ Byzantine scholar flourished early 14th century, probably Thessalonica, Byzantine Empire [now Thessaloniki, Greece]       Byzantine scholar of the Palaeologan era, ...
tricolette
/trik'euh let"/, n. a knitted fabric made of silk or synthetic yarn, used in the manufacture of wearing apparel. [1915-20; TRICO(T) + (FLANNE)LETTE] * * *
tricolor
/truy"kul'euhr/; esp. Brit. /trik"euh leuhr/, adj. 1. Also, tricolored; esp. Brit., tricoloured. having three colors. n. 2. a flag having three colors. 3. the national flag of ...
tricolor camera
a camera for taking color photographs in which three separation negatives are exposed simultaneously by splitting the light from the subject with prisms and mirrors, and exposing ...
tricolored heron
an American heron, Hydranassa tricolor, that is dark bluish-gray above and white below with seasonally red neck stripes in the male. Also called Louisiana heron. * * *
Triconodon
▪ paleontology       genus of extinct mammals (mammal) found in European deposits of the late Jurassic Period (about 161 million–146 million years ago). Triconodon is ...
tricorn
/truy"kawrn/, adj. 1. having three horns or hornlike projections; three-cornered. n. 2. Also, tricorne. a hat with the brim turned up on three sides. [1750-60; < L tricornis ...
tricornered
/truy"kawr'neuhrd/, adj. having three corners; tricorn. [1810-20; TRI- + CORNERED] * * *
tricostate
/truy kos"tayt, -kaw"stayt/, adj. Bot., Zool. having three ribs, costae, or raised lines. [1860-65; TRI- + COSTATE] * * *
tricot
/tree"koh/, n. 1. a warp-knit fabric of various natural or synthetic fibers, as wool, silk, or nylon, having fine vertical ribs on the face and horizontal ribs on the back, used ...
tricotine
/trik'euh teen", tree"keuh-/, n. See cavalry twill. [1895-1900; < F, equiv. to tricot TRICOT + -ine -INE1] * * *
tricotyledonous
/truy kot'l eed"n euhs, truy'kot-/, adj. Bot. having three cotyledons. [1820-30; TRI- + COTYLEDON + -OUS] * * *
tricresol
/truy kree"sawl, -sol/, n. Chem. a mixture of the three isomeric cresols. [TRI- + CRESOL] * * *
tricrotic
—tricrotism /truy"kreuh tiz'euhm, trik"reuh-/, n. /truy krot"ik/, adj. Physiol. 1. having three arterial beats for one heartbeat, as certain pulses. 2. pertaining to such a ...
tricrotism
See tricrotic. * * *
trictrac
/trik"trak'/, n. tricktrack. * * *
tricuspid
/truy kus"pid/, adj. 1. Also, tricuspidal. having three cusps or points, as a tooth. Cf. bicuspid. 2. Anat. of, pertaining to, or affecting the tricuspid valve. n. 3. Anat. a ...
tricuspid valve
Anat. the valve, consisting of three triangular flaps of tissue between the right auricle and ventricle of the heart, that keeps blood from flowing back into the auricle. Cf. ...
tricuspidate
/truy kus"pi dayt'/, adj. Anat. having three cusps or flaps. [1745-55; TRICUSPID + -ATE1] * * *
tricuspidvalve
tricuspid valve n. The three-segmented valve of the heart that keeps blood in the right ventricle from flowing back into the right atrium. * * *
tricyanic acid
/truy"suy an"ik, truy'-/. See cyanuric acid. [TRI- + CYANIC ACID] * * *
tricycle
/truy"si keuhl, -sik'euhl/, n. 1. a vehicle, esp. one for children, having one large front wheel and two small rear wheels, propelled by foot pedals. 2. a velocipede with three ...
tricyclic
/truy suy"klik, -sik"lik/, adj. 1. pertaining to or embodying three cycles. n. 2. Also called tricyclic antidepressant. Pharm. any of a group of pharmacologically active ...
tricyclicantidepressant
tricyclic antidepressant n. Any of a group of antidepressant drugs, such as amitryptyline, that contain three fused benzene rings and that block the reuptake of the ...
trid.
(in prescriptions) three days. [ < L triduum] * * *
Tridacna
/tri dak"neuh/, n. a genus of giant clams inhabiting reefs in the South Pacific, attaining a diameter of 4 ft. (1.2 m) or more, and weighing over 500 lb. (227 kg). [1770-80; < ...
tridactyl
/truy dak"til/, adj. Zool. having three fingers or toes, as certain reptiles. [1805-15; TRI- + -DACTYL] * * *
tridarn cupboard
/truy"dahrn/ a Welsh cupboard of the late 17th and 18th centuries, with an open, canopied upper section for display. [tridarn < Welsh, equiv. to tri THREE + darn piece] * * *
trident
/truyd"nt/, n. 1. a three-pronged instrument or weapon. 2. Rom. Hist. a three-pronged spear used by a retiarius in gladiatorial combats. 3. Class. Myth. the three-pronged spear ...
Trident missile
U.S.-made submarine-launched ballistic missile. The most advanced Trident missiles, deployed by the U.S. Navy since 1990 and by the Royal Navy since 1994, are more accurate than ...
tridentate
/truy den"tayt/, adj. having three teeth or toothlike parts or processes. [1745-55; TRIDENT + -ATE1] * * *
Tridentine
/truy den"tin, -tuyn, -teen/, adj. 1. of or pertaining to the city of Trent. 2. of or pertaining to the Council of Trent. 3. conforming to the decrees and doctrines of the ...
Tridentum
/truy den"teuhm/, n. ancient name of Trent, Italy. * * *
tridimensional
—tridimensionality, n. —tridimensionally, adv. /truy'di men"sheuh nl, -duy-/, adj. having three dimensions. [1870-75; TRI- + DIMENSIONAL] * * *
triduum
/trij"ooh euhm, trid"yooh-/, n. Rom. Cath. Ch. a series of special religious observances over a three-day period, in preparation for a great feast. [1880-85; < L triduum period ...
tridymite
/trid"euh muyt'/, n. Mineral. a polymorph of quartz occurring in the form of small crystals, commonly twinned, in siliceous volcanic rocks. [1865-70; < G Tridymit, equiv. to ...
triecious
—trieciously, adv. /truy ee"sheuhs/, adj. Bot. trioecious. * * *
tried
/truyd/, v. 1. pt. and pp. of try. adj. 2. tested and proved good, dependable, or trustworthy. 3. subjected to hardship, worry, trouble, or the like. * * *
tried-and-true
/truyd"n trooh"/, adj. tested and found to be reliable or workable. [1930-35] * * *
triene
/truy"een/, n. Chem. any compound containing three double bonds. [1925-30; TRI- + -ENE] * * *
triennial
—triennially, adv. /truy en"ee euhl/, adj. 1. occurring every three years. 2. lasting three years. n. 3. a third anniversary. 4. something that appears or occurs every three ...
triennially
See triennial. * * *
triennium
/truy en"ee euhm/, n., pl. trienniums, triennia /-en"ee euh/. a period of three years. [1840-50; < L: period of three years, equiv. to trienn(is) pertaining to three years (tri- ...
triens
/truy"enz/, n., pl. trientes /truy en"teez/. 1. a copper coin of ancient Rome, issued during the Republic, a third part of an as. 2. tremissis (def. 1). [1595-1605; < L triens ...
trier
/truy"euhr/, n. a person or thing that tries or tests; tester. [1300-50; ME triour. See TRY, -ER1] * * * ▪ Germany French  Trèves , Latin  Augusta Treverorum   city, ...
Trier
/trear/, n. a city in W Germany, on the Moselle River: extensive Roman ruins; cathedral. 93,472. Also called Treves. French, Trèves. * * * ▪ Germany French  Trèves , ...
trierarch
/truy"euh rahrk'/, n. Gk. Hist. 1. the commander of a trireme. 2. (in Athens) a citizen who, singly, or jointly with other citizens, was required to fit out a trireme for the ...
trierarchy
/truy"euh rahr'kee/, n., pl. trierarchies. Gk. Hist. 1. the office of a trierarch. 2. trierarchs collectively. 3. (in Athens) the duty of fitting out or furnishing triremes for ...
tries
/truyz/, n. 1. pl. of try. v. 2. 3rd pers. sing. pres. ind. of try: She tries to be at the head of her class. * * *
Trieste
/tree est"/; It. /trddee es"te/, n. 1. a seaport in NE Italy, on the Gulf of Trieste. 237,472. 2. Free Territory of, an area bordering the N Adriatic: originally a part of Italy; ...
triethyl
/truy eth"euhl/, adj. Chem. containing three ethyl groups. [1855-60; TRI- + ETHYL] * * *
triethyl orthoformate
Chem. a colorless liquid, C7H16O3, used chiefly in organic synthesis. Also called aethon. * * *
triethylamine
/truy eth"euhl euh meen', -eth'euhl euh meen", -am"in/, n. Chem. a colorless, flammable liquid, C6H15N, used chiefly as a solvent in chemical synthesis. [1840-50; TRI- + ETHYL + ...
trifacial
/truy fay"sheuhl/, adj. trigeminal. [1830-40; TRI- + FACIAL] * * *
trifacial neuralgia
Pathol. See tic douloureux. [1895-1900] * * *
trifecta
/truy"fek'teuh/, n. 1. a type of bet, esp. on horse races, in which the bettor must select the first three finishers in exact order. 2. a race in which such bets are made. Cf. ...
Triffin, Robert
▪ 1994       Belgian-born economist (b. Oct. 5, 1911, Flobecq, Belgium—d. Feb. 23, 1993, Ostend, Belgium), warned in 1962 that without a complete overhaul the ...
trifid
/truy"fid/, adj. cleft into three parts or lobes. [1745-55; < L trifidus split in three. See TRI-, -FID] * * *
trifid foot
Furniture. a pad foot having the form of three connected lobes. Also called drake foot. * * *
Trifid Nebula
▪ astronomy  (catalog numbers NGC 6514 and M 20), bright, diffuse nebula in the constellation Sagittarius, lying several thousand light-years from the Earth. It was ...
trifle
—trifler, n. /truy"feuhl/, n., v., trifled, trifling. n. 1. an article or thing of very little value. 2. a matter, affair, or circumstance of trivial importance or ...
trifler
See trifle. * * *
trifling
—triflingly, adv. —triflingness, n. /truy"fling/, adj. 1. of very little importance; trivial; insignificant: a trifling matter. 2. of small value, cost, or amount: a trifling ...
triflingly
See trifling. * * *
trifluoperazine
/truy flooh'euh per"euh zeen'/, n. Pharm. a compound, C21H24F3N3S, used as an antipsychotic. [1955-60; TRI- + FLUO- + (PI)PERAZINE] * * *
trifluoride
/truy floor"uyd, -flawr"-, -flohr"-/, n. Chem. a fluoride containing three atoms of fluorine. [1840-50; TRI- + FLUORIDE] * * *
trifluorochloromethane
/truy floor'oh klawr'oh meth"ayn, -flawr'-; truy floor'oh klohr'oh meth"ayn, -flohr'-/, n. Chem. chlorotrifluoromethane. [TRI- + FLUORO- + CHLORO-2 + METHANE] * * *
trifluralin
/truy floor"euh lin/, n. Chem. a selective herbicide, C13H16F3N3O4, used to control weeds. [1960-65; prob. triflu(o)r(omethyl)a(ni)lin(e), a chemical component; see TRI-, ...
trifocal
/truy foh"keuhl, truy"foh'-/, adj. 1. Optics. having three foci. 2. (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision. n. 3. ...
trifocals
☆ trifocals [trī′fō΄kəlz ] pl.n. eyeglasses with trifocal lenses * * *
trifold
/truy"fohld'/, adj. 1. triple; threefold. 2. having three parts: a trifold screen. [1570-80; TRI- + -FOLD] * * *
trifoliate
/truy foh"lee it, -ayt'/, adj. 1. having three leaflets, lobes, or foils; trefoil. 2. Bot. trifoliolate. Also, trifoliated. [1690-1700; TRI- + FOLIATE] * * *
trifoliate orange
a spiny, Chinese orange tree, Poncirus trifoliata, used as a stock in grafting and for hedges. * * *
trifoliolate
/truy foh"lee euh layt'/, adj. Bot. 1. having three leaflets, as a compound leaf. 2. having leaves with three leaflets, as a plant. [1820-30; TRI- + FOLIOLATE] * * *
trifolium
trifolium [trīfō′lē əm] n. 〚L, TREFOIL〛 CLOVER (sense 1) * * *
triforium
—triforial, adj. /truy fawr"ee euhm, -fohr"-/, n., pl. triforia /-fawr"ee euh, -fohr"-/. Archit. (in a church) the wall at the side of the nave, choir, or transept, ...
triform
/truy"fawrm'/, adj. 1. formed of three parts; in three divisions. 2. existing or appearing in three different forms. 3. combining three different forms. Also, ...
triformed
tri·formed (trīʹfôrmd') also tri·form (-fôrm') adj. Having three different forms or parts. * * *
trifunctional
/truy fungk"sheuh nl/, adj. Chem. pertaining to molecules that can react at three sites. [1925-30; TRI- + FUNCTIONAL] * * *
trifurcate
—trifurcation, n. /truy ferr"kayt, truy"feuhr kayt'/; adj. also /truy ferr"kit, truy"feuhr-/, v., trifurcated, trifurcating, adj. v.i. 1. to divide into three forks or ...
trifurcation
See trifurcate. * * *
trig
trig1 /trig/, n. Informal. trigonometry. [by shortening] trig2 —trigness, n. /trig/, adj., v., trigged, trigging. adj. Chiefly Brit. 1. neat, trim, smart, or spruce. 2. in good ...
trig function
Math. See trigonometric function. * * *
trig.
1. trigonometric. 2. trigonometrical. 3. trigonometry. * * *
triga
/tree"geuh, truy"-/, n., pl. trigae /-guy, -jee, -gee/. Class. Antiq. a two-wheeled chariot drawn by a team of three horses. Cf. biga, quadriga. [ < LL triga, contr. of L ...
trigamous
/trig"euh meuhs/, adj. 1. of or pertaining to trigamy or a trigamist. 2. Bot. having staminate, pistillate, and hermaphrodite flowers in the same flower head. [1835-45; < Gk ...
trigamy
—trigamist, n. /trig"euh mee/, n. 1. the state of having three wives or three husbands at one time. 2. the state of having been lawfully married to three wives or three ...
Trigano, Gilbert
▪ 2002       French businessman (b. July 28, 1920, St.-Maurice, Val-de-Marne, France—d. Feb. 4, 2001, Paris, France), was cofounder (1950), with his Belgian partner, ...
trigeminal
/truy jem"euh nl/, Anat. adj. 1. of or pertaining to the trigeminal nerve. n. 2. Also called trigeminal nerve. either one of the fifth pair of cranial nerves, consisting of motor ...
trigeminal neuralgia
Pathol. See tic douloureux. [1870-75] * * *
trigeminalnerve
trigeminal nerve n. Either of the fifth pair of cranial nerves, having sensory and motor functions in the face, teeth, mouth, and nasal cavity. Also called trigeminus. * * *
trigeminalneuralgia
trigeminal neuralgia n. Paroxysmal shooting pains of the facial area around one or more branches of the trigeminal nerve, of unknown cause, but often precipitated by irritation ...
trigeminus
tri·gem·i·nus (trī-jĕmʹə-nəs) n. pl. tri·gem·i·ni (-nī') See trigeminal nerve.   [New Latin, from Latin, born as three twins, triple : tri-, tri- + geminus, ...
Trigère
/tri zhair", -jair"/; Fr. /trddee zherdd"/, n. Pauline, born 1912, U.S. fashion designer, born in France. * * *
Trigere, Pauline
▪ 2003       French-born American fashion designer (b. 1908, Paris, France—d. Feb. 13, 2002, New York, N.Y.), was prominent in the world of fashion for some half a ...
trigger
/trig"euhr/, n. 1. a small projecting tongue in a firearm that, when pressed by the finger, actuates the mechanism that discharges the weapon. 2. a device, as a lever, the ...
trigger finger
1. any finger, usually the forefinger, that presses the trigger of a gun. 2. either forefinger, depending on which hand is dominant. 3. Pathol. difficulty in straightening or ...
trigger mechanism
a physiological or psychological process caused by a stimulus and resulting in a usually severe reaction. * * *
trigger-happy
/trig"euhr hap'ee/, adj. Informal. 1. ready to fire a gun at the least provocation, regardless of the situation or probable consequences: a trigger-happy hunter. 2. heedless and ...
triggerfish
/trig"euhr fish'/, n., pl. (esp. collectively) triggerfish, (esp. referring to two or more kinds or species) triggerfishes. any of various compressed, deep-bodied fishes of the ...
triggerman
/trig"euhr meuhn, -man'/, n., pl. triggermen /-meuhn, -men'/. Informal. 1. a gangster who specializes in gunning people down. 2. a bodyguard, esp. of a gangster. Also called ...
Triglav
▪ mountain, Slovenia Italian  Tricorno,         mountain peak, the highest (9,396 feet [2,864 m]) of Slovenia and of the Julian Alps, situated 40 miles (64 km) ...
trigly
See trig1. * * *
triglyceride
/truy glis"euh ruyd', -euhr id/, n., Biochem., Chem. an ester obtained from glycerol by the esterification of three hydroxyl groups with fatty acids, naturally occurring in ...
triglyph
—triglyphed, adj. —triglyphic, triglyphical, adj. /truy"glif'/, n. Archit. a structural member of a Doric frieze, separating two consecutive metopes, and consisting typically ...
triglyphic
See triglyph. * * *
trigness
See trigly. * * *
trigo
/tree"goh/; Sp. /trddee"gaw/, n., pl. trigos /-gohz/; Sp. /-gaws/. wheat; field of wheat. [ < Sp < L triticum wheat, equiv. to trit(us) ground, rubbed to pieces (ptp. of terere ...
trigon
/truy"gon/, n. 1. a triangle. 2. an ancient Greek stringed instrument with a triangular shape. 3. Astrol. Archaic. a. trine. b. triplicity. [1555-65; < L trigonum triangle < Gk ...
trigon.
1. trigonometric. 2. trigonometrical. 3. trigonometry. * * *
trigonal
—trigonally, adv. /trig"euh nl/, adj. 1. of, pertaining to, or shaped like a triangle; having three angles; triangular. 2. Crystall. having threefold symmetry. [1560-70; TRIGON ...
trigonal system
▪ crystallography also called  Rhombohedral System,        one of the structural categories to which crystalline solids can be assigned. The trigonal system is ...
trigonal trisoctahedron
a trisoctahedron whose faces are triangles. [1890-95] * * *
trigone
/truy"gohn/, n. 1. Also, trigonum. Anat. a. a triangular part or area. b. the area on the floor of the urinary bladder between the opening of the urethra in front and the two ...
Trigonia
▪ bivalve       genus of mollusks that first appeared during the Jurassic period, which began about 208 million years ago. The still-extant Trigonia has a triangular ...
trigonometric
See trigonometry. * * *
trigonometric equation
Math. an equation involving trigonometric functions of unknown angles, as cos B = 1/2. * * *
trigonometric function
Math. 1. Also called circular function. a function of an angle, as sine or cosine, expressed as the ratio of the sides of a right triangle. 2. any function involving only ...
trigonometric series
Math. an infinite series involving sines and cosines of increasing integral multiples of a variable. * * *
trigonometrical
See trigonometric. * * *
trigonometrically
See trigonometric. * * *
trigonometricfunction
trigonometric function n. A function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, ...
trigonometry
—trigonometric /trig'euh neuh me"trik/, trigonometrical, adj. —trigonometrically, adv. /trig'euh nom"i tree/, n. the branch of mathematics that deals with the relations ...
trigonometry table
 tabulated values for some or all of the six trigonometric functions for various angular values. Once an essential tool for scientists, engineers, surveyors, and navigators, ...
trigonous
/trig"euh neuhs/, adj. having three angles or corners, as a stem or seed; triangular. [1750-60; < L trigonus triangular < Gk trígonos. See TRI-, -GON, -OUS] * * *

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