| Trunnion 1. (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. 2. (n.) A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam. Thesaurus Entries alcove, axis, axle, axle bar, axle shaft, axle spindle, axle-tree, belvedere, bower, casino, conservatory, distaff, fulcrum, gazebo, gimbal, glasshouse, greenhouse, gudgeon, hinge, hingle, hub, kiosk, lathhouse, mandrel, nave, oarlock, pergola, pin, pintle, pivot, pole, radiant, retreat, rowlock, spindle, summerhouse, swivel, trunnion |