Definition of yam noun from the Oxford Advanced Learner's Dictionary

 

yam

 noun
noun
BrE BrE//jæm//
 
; NAmE NAmE//jæm//
 
[countable, uncountable] Vegetables
 
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the large root of a tropical plant that is cooked as a vegetable See related entries: Vegetables Word Origin late 16th cent.: from Portuguese inhame or obsolete Spanish iñame, probably of West African origin.
See the Oxford Advanced American Dictionary entry: yam