# acorn nut

> English word · Noun

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

## Etymology
From acorn + nut, because it resembles an acorn.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/acorn-nut