Trochlea
Trochlea , noun
[Latin, a case or sheaf containing one or more pulleys, Greek {not transcribed}. See Trochilics.]
1.
(Machinery) A pulley. [Obsolete]
2.
(Anatomy) 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.