triceps (n.)youdaoicibaDictYouDict[triceps 词源字典]
the great extensor muscle, 1704, from Latin triceps "three-headed," from tri- "three" (see tri-) + -ceps, from caput "head" (see capitulum). So called because the muscle has three origins.[triceps etymology, triceps origin, 英语词源]
triceratops (n.)youdaoicibaDictYouDict
dinosaur genus, 1890, from Greek trikeratos "three-horned" + ops "face," literally "eye," from PIE *okw- "to see" (see eye (n.)). The first element is from tri- "three" (see three) + keras (genitive keratos) "horn" (see kerato-).
trichinosis (n.)youdaoicibaDictYouDict
"disease caused by trichinae," 1864, coined by Bernhard Rupprecht (1815-1877) by 1864 from trichina (1835), Modern Latin, genus name of the minute, hair-like parasitic worms that cause it, from Greek trikhine, fem. of trikhinos "of or like hair," from thrix (genitive trikhos) "hair."
trichomoniasis (n.)youdaoicibaDictYouDict
1915, with -iasis + trichomonas, genus of a family of flagellate parasites, from tricho-, Latinized form of Greek trikho-, comb. form of thrix (genitive trikhos) "hair" + -monas.
trichotillomania (n.)youdaoicibaDictYouDict
1905, from French trichotillomanie (1889), from tricho-, Latinized form of Greek trikho-, comb. form of thrix (genitive trikhos) "hair" + Greek tillesthai "to pull out" + mania.
trick (n.)youdaoicibaDictYouDict
early 15c., "a cheat, a mean ruse," from Old North French trique "trick, deceit, treachery, cheating," from trikier "to deceive, to cheat," variant of Old French trichier "to cheat, trick, deceive," of uncertain origin, probably from Vulgar Latin *triccare, from Latin tricari "be evasive, shuffle," from tricæ "trifles, nonsense, a tangle of difficulties," of unknown origin.

Meaning "a roguish prank" is recorded from 1580s; sense of "the art of doing something" is first attested 1610s. Meaning "prostitute's client" is first attested 1915; earlier it was U.S. slang for "a robbery" (1865). To do the trick "accomplish one's purpose" is from 1812; to miss a trick "fail to take advantage of opportunity" is from 1889; from 1872 in reference to playing the card-game of whist, which might be the original literal sense. Trick-or-treat is recorded from 1942. Trick question is from 1907.
trick (v.)youdaoicibaDictYouDict
"deceive by trickery," 1590s, from trick (n.). Related: Tricked; tricking. The sense of "to dress, adorn" (c. 1500) is perhaps a different word entirely.
trickery (n.)youdaoicibaDictYouDict
1719, from trick (v.) + -ery.
trickle (n.)youdaoicibaDictYouDict
1570s, from trickle (v.).
trickle (v.)youdaoicibaDictYouDict
late 14c., intransitive, of uncertain origin, possibly a shortened variant of stricklen "to trickle," a frequentative form of striken "to flow, move" (see strike (v.)). Transitive sense from c. 1600. Related: Trickled; trickling. Trickle-down as an adjectival phrase in an economic sense first recorded 1944; the image had been in use at least since Teddy Roosevelt.
trickster (n.)youdaoicibaDictYouDict
1711, from trick (n.) + -ster.
tricky (adj.)youdaoicibaDictYouDict
1786, "characterized by tricks," from trick (n.) + -y (2). Meaning "deceptively difficult" is from 1868. Related: Trickily; trickiness. Earlier was tricksy (1590s).
tricolor (n.)youdaoicibaDictYouDict
also tricolour, 1798, "flag having three colors," especially the emblem of France adopted during the Revolution, from French tricolore, in drapeau tricolore "three-colored flag." The arrangement of colors on the modern French national flag dates from 1794.
tricot (n.)youdaoicibaDictYouDict
knitted fabric, 1859, from French tricot "knitting, knitted work," from tricoter "to knit," of uncertain origin, probably a variant of Old French estriquer "to smooth," from a Germanic source (such as Middle Low German striken "pass over lightly").
tricuspid (n.)youdaoicibaDictYouDict
1660s, from Latin tricuspidem (nominative tricuspis) "three-pointed," from tri- (see tri-) + cuspis "point" (see cusp).
tricycle (n.)youdaoicibaDictYouDict
1828, "three-wheeled horse-drawn carriage," from French tricycle (1827); see tri- + cycle (n.). The pedal-powered version is first attested 1868.
trident (n.)youdaoicibaDictYouDict
"three-pointed spear," mid-15c., from Latin noun use of adjective tridentem (nominative tridens) "three-pronged, three-toothed," from tri- "three" (see tri-) + dens "tooth" (see tooth). As a type of U.S. nuclear-powered submarine, recorded from 1972. Related: Tridental.
tried (adj.)youdaoicibaDictYouDict
"tested, proven, trusty," mid-14c., past participle adjective from try (v.). Coupled since mid-14c. with true.
triennial (adj.)youdaoicibaDictYouDict
1630s, "lasting three years;" 1640s, "occurring every three years," with -al (1) + Latin triennium "three-year period," from tri- "three" (see tri-) + annus "year" (see annual). For vowel change, see biennial. As a noun, 1630s. Related: Triennially.
TrieryoudaoicibaDictYouDict
city in Germany (French Trèves), founded c. 15 B.C.E. by Augustus, named for the indigenous Gaulish people, the Treveri.