1. n. (also y) (pl. Ys or Y's)
1. the twenty-fifth letter of the alphabet.
2 (usu. y) Algebra the second unknown quantity.
3 Geom. the second coordinate.
4 a a Y-shaped thing, esp. an arrangement of lines, piping, roads, etc. b a forked clamp or support. 2. abbr. (also Y.)
1. yen.
2 Yeomanry.
3 US YMCA, YWCA. 3.
symb. Chem. the element yttrium.