Etymology
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trey (n.)

late 14c., "card, die, or domino with three spots," from Anglo-French, Old French treis (Modern French trois), oblique case of treie "three," from Latin tria (neuter) "three" (see three). In slang use for "three (of anything)" from 1887.

updated on February 16, 2014

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Definitions of trey from WordNet

trey (n.)
the cardinal number that is the sum of one and one and one;
Synonyms: three / " / iii / trio / threesome / tierce / leash / troika / triad / trine / trinity / ternary / ternion / triplet / tercet / terzetto / deuce-ace
trey (n.)
one of four playing cards in a deck having three pips;
Synonyms: three
From wordnet.princeton.edu, not affiliated with etymonline.