Definition of sweet potato noun from the Oxford Advanced Learner's Dictionary

 

sweet potato

 noun
noun
BrE BrE//ˌswiːt pəˈteɪtəʊ//
 
; NAmE NAmE//ˌswiːt pəˈteɪtoʊ//
 
[countable, uncountable] Vegetables
 
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a root vegetable that looks like a red potato, but that is yellow inside and tastes sweet See related entries: Vegetables
See the Oxford Advanced American Dictionary entry: sweet potato