Webster's English Dictionary

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pea

pea \'pe-\ \'pe-z\ n or peas also pease [back-formation fr. ME pease (taken 
   as a pl.), fr. OE pise, fr. L (] pl  often attribXpisa, pl. of pisum, fr. 
   Gk pison 1a: a variable annual leguminous vine (Pisum sativum) cultivated 
   for  its rounded smooth or wrinkled edible protein-rich seeds 1b: the seed 
   of the pea  pl  1c: the immature pods of the pea with their included seeds  
   2a: any of various leguminous plants related to or resembling the pea - u 
   su. used with a qualifying term 2b: the seed of such a plant  3: something 
   resembling a pea usu. in size, shape, or formation