\Mal*le"*o*lus\, n.; pl. {Malleoli}. [L., dim. of
malleus hammer.]
1. (Anat.) A projection at the distal end of each bone of the
   leg at the ankle joint. The malleolus of the tibia is the
   internal projection, that of the fibula the external.

2. `` A layer, '' a shoot partly buried in the ground, and
   there cut halfway through.