acorn nut

noun

Definition of acorn nut 

hardware

: 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

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First Known Use of acorn nut

1890, in the meaning defined above

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The first known use of acorn nut was in 1890

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