Definition of ryegrass noun from the Oxford Advanced Learner's Dictionary

 

ryegrass

 noun
noun
BrE BrE//ˈraɪɡrɑːs//
 
; NAmE NAmE//ˈraɪɡræs//
 
[uncountable]
 
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a type of grass which is grown as food for animals Word Origin early 18th cent.: alteration of obsolete ray-grass, of unknown origin.
See the Oxford Advanced American Dictionary entry: ryegrass