trochlea

‖n. [ L., a case or sheaf containing one or more pulleys, Gr. &unr_;. See Trochilics. ] 1. (Mach.) A pulley. [ Obs. ] [ 1913 Webster ]

2. (Anat.) A pulley, or a structure resembling a pulley; as, the trochlea, or pulleylike end, of the humerus, which articulates with the ulna; or the trochlea, or fibrous ring, in the upper part of the orbit, through which the superior oblique, or trochlear, muscle of the eye passes. [ 1913 Webster ]