Source : Webster's Revised Unabridged Dictionary (1913)

Peroneal \Per`o*ne"al\, a. [Gr. ? the fibula.] (Anat.)
   Of or pertaining to the fibula; in the region of the fibula.

Source : WordNet®

peroneal
     adj : of or relating to the fibula or the outer part of the leg
           below the knee