The Collaborative International Dictionary of English v.0.48:
Wye \Wye\, n.; pl. Wyes. [1913 Webster] 1. The letter Y. [1913 Webster] 2. A kind of crotch. See Y, n. (a) . [1913 Webster]WordNet (r) 3.0 (2006):
wye n 1: the 25th letter of the Roman alphabet [syn: Y, y, wye]