Source : Webster's Revised Unabridged Dictionary (1913)

Enchondroma \En`chon*dro"ma\, n. [NL., fr. Gr. ? in + ?
   cartilage + -oma.] (Med.)
   A cartilaginous tumor growing from the interior of a bone.
   --Quain.

Source : WordNet®

enchondroma
     n : benign slow-growing tumor of cartilaginous cells at the ends
         of tubular bones (especially in the hands and feet)
     [also: {enchondromata} (pl)]