whatsit
noun [C] /ˈwɒt.sɪt/
/ˈwɑːt-/ informalDefinition
› any object or person whose name you have temporarily forgotten or do not know: Where's the whatsit that you change channels with? You'd better tell whatsit - what's his name - the guy in charge of stationery.Names and titles
(Definition of whatsit noun from the Cambridge Advanced Learner's Dictionary & Thesaurus
© Cambridge University Press)
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