Share this entry

Share this page

trunnion

Syllabification: trun·nion
Pronunciation: /ˈtrənyən
 
/

Definition of trunnion in English:

noun

1A pin or pivot forming one of a pair on which something is supported.
Example sentences
  • The introduction of trunnions, the pivots in the middle of the barrel permitting it to move independently of the carriage, was a simple but important development.
  • The main frame of this machine is fitted at its base with trunnions, which work in a foundation plate.
  • Although the compass carries no maker's marks, it is designed to fit across the transit's trunnions and has a pin that fits a hole on the transit.
1.1A supporting cylindrical projection on each side of a cannon or mortar.
Example sentences
  • The gun is fitted with a trunnion mounted telescopic sight for direct firing up to 3,000m.
  • As with the machine-gun platform, the turntable and trunnions are intact, but the gun itself is missing.
  • The barrel and breech have been salvaged, so all that remains at the top are a pair of trunnions.

Origin

early 17th century: from French trognon 'core, tree trunk', of unknown origin.

Definition of trunnion in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day prepotent
Pronunciation: prɪˈpəʊt(ə)nt
adjective
greater than others in power or influence