The Collaborative International Dictionary of English v.0.48:
Rye \Rye\ (r[imac]), n. [OE. rie, reie, AS. ryge; akin to Icel.
rugr, Sw. r[*a]g, Dan. rug, D. rogge, OHG. rocco, roggo, G.
rocken, roggen, Lith. rugei, Russ. roje, and perh. to Gr.
'o`ryza rice. Cf. Rice.]
1. (Bot.) A grain yielded by a hardy cereal grass (Secale
cereale), closely allied to wheat; also, the plant
itself. Rye constitutes a large portion of the breadstuff
used by man.
2. A disease in a hawk. --Ainsworth.
Rye grass, Italian rye grass, (Bot.) See under Grass.
See also Ray grass, and Darnel.
Wild rye (Bot.), any plant of the genus Elymus, tall
grasses with much the appearance of rye.
WordNet (r) 3.0 (2006):
n 1: any of several grasses of the genus Elymus