Webster's English Dictionary

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trochlea

troch.lea \'tra:k-le--*\ n [NL, fr. L, block of pulleys, fr. Gk trochileia; 
   akin to Gk trecheinX to run : an anatomical structure felt to resemble a 
   pulley; esp : the art icular surface on the medial condyle of the humerus 
   that articulates with the ulna