trunnion

Etymology
From.

Noun

 * 1) One of the short stubby bearings on either side of a cannon; a gudgeon.
 * 2) A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool.
 * 3) A shaft, held by a bearing, at each end or side of a rotatable object.
 * 4) A similar rotational bearing used in automotive suspensions.
 * 1) A similar rotational bearing used in automotive suspensions.