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

 

doohickey

 noun
noun
BrE BrE//ˈduːhɪki//
 
; NAmE NAmE//ˈduːhɪki//
 
(North American English, informal)
 
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a small object whose name you have forgotten or do not know, especially part of a machine
See the Oxford Advanced American Dictionary entry: doohickey