From Middle English thre, threo, thrie, thri, from Old English þrī, from Proto-West Germanic *þrīʀ, from Proto-Germanic *þrīz, from Proto-Indo-European *tréyes. trey.
Cognates with German drei, Albanian tre, Armenian երեք, Latvian trīs, Lithuanian trỹs, Greek τρεῖς, and others.
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