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A pin or gudgeon, especially either of two small cylindrical projections on a cannon forming an axis on which it pivots.
[French trognon, stump.]
1. (Mechanical Engineering) one of a pair of coaxial projections attached to opposite sides of a container, cannon, etc, to provide a support about which it can turn in a vertical
2. (Mechanical Engineering) the structure supporting such a projection
[C17: from Old French trognon trunk]
1. either of the two cylindrical projections on a cannon, one on each side, for supporting the cannon on its carriage.
2. any of various similar supports for machinery.
[1615–25; < French trognon trunk, stump, core (of fruit)]