Simple Definition of whatsit
: something whose name you have forgotten or do not know
Full Definition of whatsit
Examples of whatsit
<there's always one random whatsit left over every time I put a bookcase together>
Origin of whatsit
whatsit & whatsis contraction of what-is-it
First Known Use: circa 1882
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Thesaurus: All synonyms and antonyms for "whatsit"
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