From Longman Dictionary of Contemporary Englishryegrassrye‧grass /ˈraɪɡrɑːs $ -ɡræs/ noun [uncountable] TACa type of grass that is grown as food for animals
Examples from the Corpus
ryegrass• I wade chest-high in bleached ryegrass murmuring in the wind, and spy down the rugged coast of California.• Quite distinct phenotypic modifications were elicited from the clone by the different ryegrass strains. 