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trunnion n. 炮耳,空枢,耳轴 炮耳,空枢,耳轴 Trunnion \ 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}. [ 1913 Webster] 2. ( Steam Engine) A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam. [ 1913 Webster] { 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.] [ 1913 Webster]
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