Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

three, triad, triplet, trey, trio, ternion†, leash; shamrock, tierce†, spike-team [U.S.], trefoil; triangle, trident, triennium†, trigon†, trinomial, trionym†, triplopia†, tripod, trireme, triseme†, triskele†, triskelion, trisula†. third power, cube; cube root. Adj. three; triform†, trinal†, trinomial; tertiary; ternary; triune; triarch, triadie†; triple &c 93. tri- [Pref.], tris- [Pref.]. Phr. tria juncta in uno [Lat.].