ryegrass
/ˈraɪgrɑːs/noun
mass noun
1- a Eurasian grass which is a valuable fodder and lawn grass黑麦草。
1.1
- Genus Lolium, family Gramineae: several species, in particular L. perenne.黑麦草属, 禾本科：数种, 尤指黑麦草。
词源
early 18th cent.: alteration of obsolete ray-grass, of unknown origin.