ryegrass
Concise Oxford English Dictionary © 2008 Oxford University Press:
ryegrass/ˈrʌɪɡrɑːs/
▶noun a grass used for fodder and lawns. [Genus Lolium: several species, in particular L. perenne.]
– origin C18: alt. of obs. ray-grass, of unknown origin.
'ryegrass' also found in these Oxford entries:

