acorn nut


: a nut with a dome-shaped head that is used to cover the threaded end of a bolt
… few things are more beautiful to car buffs than the sight of two long polished cam covers held down by acorn nuts.Bill Vance, Toronto Star, 2 Jan. 1988

Word History

First Known Use

1890, in the meaning defined above

Time Traveler
The first known use of acorn nut was in 1890

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Dictionary Entries Near acorn nut

Cite this Entry

“Acorn nut.” Dictionary, Merriam-Webster, Accessed 2 Dec. 2023.

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