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

 

doughnut

 noun
(also donut especially in North American English)noun
BrE BrE//ˈdəʊnʌt//
 
; NAmE NAmE//ˈdoʊnʌt//
 
 
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a small cake made of fried dough, usually in the shape of a ring, or round and filled with jam/jelly, fruit, cream, etc.
See the Oxford Advanced American Dictionary entry: doughnut