plantar

from WordNet (r) 3.0 (2006)

plantar
    adj 1: relating to or occurring on the undersurface of the foot;
           "plantar warts can be very painful"

from The Collaborative International Dictionary of English v.0.48

Plantar \Plan"tar\, a. [L. plantaris, fr. planta the sole of the
   foot.] (Anat.)
   Of or pertaining to the sole of the foot; as, the plantar
   arteries.
   [1913 Webster]