acorn nut

noun

Definition of acorn nut

hardware

  1. :  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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1890

First Known Use of acorn nut

1890


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