acorn nut

noun

A closed nut having a dome-like cap over the rear protruding part of the engaged screw or bolt.

Meanings

nounacorn nut (plural acorn nuts)

plural acorn nuts

  1. engineeringA closed nut having a dome-like cap over the rear protruding part of the engaged screw or bolt.

    Synonyms: cap nut, dome nut

Synonyms & antonyms

nounA closed nut having a dome-like cap over the rear protruding part of the engaged screw or bolt.

Origin

From acorn + nut, because it resembles an acorn.

Full word history & related roots →
Cite this entry
APA

acorn nut. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/acorn%20nut

MLA

“acorn nut.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/acorn%20nut. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “acorn nut,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/acorn%20nut.

Source: acorn nut on Wiktionary, CC BY-SA 4.0.