English

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

 

whatsit

 noun
noun
BrE BrE//ˈwɒtsɪt//
 
; NAmE NAmE//ˈwɑːtsɪt//
 
, NAmE//ˈwʌtsɪt//
 
(informal, especially British English)
 
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used when you cannot think of the word or name you want, or do not want to use a particular word I've got to make a whatsit for the party. That's it—a flan.