ray grass

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) A perennial European grass (Lolium perenne); -- called also rye grass, and red darnel. See darnel, and grass.
• See Darnel, and Grass.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A perennial European grass (Lolium perenne); rye grass; red darnel.