Category:Trunnion

Trun"nion, n. Etym: [of. trognon the stock, stump, or truck of a Tree, f. trognon a core, stalk, fr.tron a trunk, stem. Cf. Trunk.]

1. (gun.)

Defn: a cylindrical projection on each side of a piece, whether gun, Mortar, or howitzer, serving to support it on the cheeks of the Carriage. See illust. of cannon.

2. (steam engine)

Defn: a gudgeon on each side of an oscillating steam cylinder, to Support it. It is usually tubular, to convey steam. Trunnion plate (gun.), a plate in the carriage of a gun, mortar, or howitzer, which Covers the upper part of the cheek, and forms a bearing under the Trunnion. -- trunnion ring (gun.), a ring on a cannon next before the Trunnions. [r.]