Trun"nion (?), n. [OF. trognon the stock, stump, or truck of a tree, F. trognon a core, stalk, fr.tron a trunk, stem. Cf. Trunk.]

1. Gun.

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

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.]

 

© Webster 1913.

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