noun (n)

• weedy annual grass often occurs in grainfields and other cultivated land; seeds sometimes considered poisonous(noun.plant)

  Synonym:
  bearded darnel, cheat, lolium temulentum, tare
  

  source: wordnet30
• Any grass of the genus Lolium, esp. the Lolium temulentum (bearded darnel), the grains of which have been reputed poisonous. Other species, as Lolium perenne (rye grass or ray grass), and its variety L. Italicum (Italian rye grass), are highly esteemed for pasture and for making hay.(noun)

  source: webster1913