SWIVEL n.
vertical axis; a swing bridge. -- Swivel hook, a hook connected with the iron strap of a pulley block by a swivel joint, for readily taking the turns out of a tackle. -- Swivel joint, a joint, the two pieces composing which turn round, with respect to each other, on a longitudinal pin or axis, as in a chain, to preve…
TROCHLEAR n.
Shaped like, or resembling, a pulley; pertaining to, or connected with, a trochlea; as, a trochlear articular surface; the trochlear muscle of the eye. Trochlear nerve. See Pathetic nerve, under Pathetic.