Noun rye grass has 1 sense
  1. rye grass, ryegrass - any of several annual or perennial Eurasian grasses
    --1 is a kind of grass
    --1 is a member of Lolium, genus Lolium
    --1 has particulars:
     perennial ryegrass, English ryegrass, Lolium perenne; Italian ryegrass, Italian rye, Lolium multiflorum; darnel, tare, bearded darnel, cheat, Lolium temulentum
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