01 n. A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. Se…
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1.
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.(Gun.) See: Cannon
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2.
A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam.(Steam Engine)
Phrases & compounds
Trunnion plate —
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 —
a ring on a cannon next before the trunnions.