acorn nut
English
![](Images/wiktionary/Acorn_nuts.jpg.webp)
acorn nuts
Etymology
acorn + nut, because it looks like an acorn.
Noun
acorn nut (plural acorn nuts)
- (engineering) A closed nut having a dome-like cap over the rear protruding part of the engaged screw or bolt.
Synonyms
- cap nut