Troch"le*a (?), n. [L., a case or sheaf containing one or more pulleys, Gr. . See Trochilics.]
1. Mach.
A pulley.
[Obs.]
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.
© Webster 1913.