: a pin or pivot on which something can be rotated or tilted
especially
: either of two opposite gudgeons on which a cannon is swiveled
Examples of trunnion in a Sentence
Recent Examples on the Web
Use grease on choke tube threads and on the trunnions or hinge-pin where the barrels pivot on a break-action, and on the knuckle, the half-round piece on some break-action frames that bear on the forend iron.
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Phil Bourjaily, Field & Stream, 27 Feb. 2023
Chicago’s first trunnion bascule bridge — is built over the North Branch of the Chicago River.
—Chicago Tribune, 26 June 2022
The lane closure is scheduled from Sept. 28 - Oct. 4 as construction crews reconnect the median barrier and wrap up from the trunnion project.
—oregonlive, 25 Sep. 2020
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Phil Bourjaily, Field & Stream, 27 Feb. 2023
Chicago’s first trunnion bascule bridge — is built over the North Branch of the Chicago River.
—Chicago Tribune, 26 June 2022
The lane closure is scheduled from Sept. 28 - Oct. 4 as construction crews reconnect the median barrier and wrap up from the trunnion project.
—oregonlive, 25 Sep. 2020
Cite this Entry
“Trunnion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trunnion. Accessed 18 Sep. 2025.
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