whatsit
nounUK /ˈwɒtsɪt/
US /ˈwʌtsɪt/
A whatsit is a thing whose name you do not know or cannot remember.
Can you pass me that little whatsit on the table?
RELATED WORDS
OTHER MEANINGS
2. A small tool or device whose name the speaker has forgotten.
He fixed the sink with some whatsit from his toolbox.
3. A person whose name the speaker cannot recall.
I saw old whatsit at the shop yesterday.
4. An unspecified part or detail of something.
The whatsit on the form needs your signature.