Trunnion

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]