TRUNNIONS

Noun

trunnions

plural of trunnion

Source: Wiktionary

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.)

Definition: 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)

Definition: 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.]

Source: Webster’s Unabridged Dictionary 1913 Edition

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