Webster's English Dictionary

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yam

yam \'yam\ n [earlier iname, fr. Pg inhame & Sp n@ame] 1: the edible 
   starchy tuberous root of various plants (genus DioscoreaX of the family 
   Dioscoreaceae) used as a staple food in tropical areas; also : a plant 
   producing these 2: a moist-fleshed and usu. orange-fleshed sweet potato