ryegrassPronunciation: /ˈrʌɪgrɑːs/Definition of ryegrass noun [mass noun] a Eurasian grass which is a valuable fodder and lawn grass. Genus Lolium, family Gramineae: several species, in particular L. perenne Origin: early 18th century: alteration of obsolete ray-grass, of unknown originryegrass in other Oxford dictionaries Definition of ryegrass in the US English dictionary
