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Webster's Dictionary (1865)

Trŏch'le-ā, n.

noun

n. [Lat. trochlea, Gr. τροχαλία, a case or sheaf containing one or more pulleys; Fr. trochlée. See TROCHLEICS.]

  1. (Mach.) A pulley. [Obs.]
  2. (Anat.) (a.) A pulley-like cartilage, through which the tendon of the trochleary muscle passes. (b.) The articular surface at the lower extremity of the shoulder-bone; — so called as forming a sort of pulley on which the ulna moves in the flection and extension of the fore-arm. Dunglison.