trunnion
noun
- either of two projecting pivots, located on each side of a cannon or its mount, by which the muzzle is raised and lowered
- either of any similar pair of pins or pivots
See trunnion in American Heritage Dictionary 4
(trŭnˈyən)
noun A pin or gudgeon, especially either of two small cylindrical projections on a cannon forming an axis on which it pivots.
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