Webster's English Dictionary

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oat

oat \'o-t\ n [ME ote, fr. OE a-te] often attrib  1a1: any of several 
   grasses (genus Avena); esp : a widely cul tivated cereal grass (Avena 
   sativa) usu pl but sing or pl in constr  1a2: a crop or plot of the oat  
   usu pl but sing or pl in constr  1b: oat seed  archaic  2: a reed 
   instrument made of an oat straw