Webster's English Dictionary

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onion

on.ion \'*n-y*n\ n [ME, fr. MF oignon, fr. L union-, unio] often attrib  1: 
   a widely cultivated Asiatic herb (Allium cepa) of the lily family  with 
   pungent edible bulbs; also : its bulb 2: any of various plants of the same 
   genus as the onion