acorn nut

English

Etymology

From acorn +‎ nut, because it resembles an acorn.

Noun

acorn nut (plural acorn nuts)

  2. (engineering) A closed nut having a dome-like cap over the rear protruding part of the engaged screw or bolt.
    Synonyms: cap nut, dome nut
    Hypernyms: nut < fastener < hardware
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