Webster's English Dictionary

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potato

po.ta.to \p*-'ta-t-(.)o-, p*t-'a-t-, -*(-w)\ n or potatoes [Sp batata, fr. 
   Taino] pl  often attrib  1: SWEET POTATO  2a: an erect American herb 
   (Solanum tuberosum) of the nightshade fami ly widely cultivated as a 
   vegetable crop 2b: its edible starchy tuber