mesial

from WordNet (r) 3.0 (2006)
mesial
    adj 1: being in or directed toward the midline or mesial plane
           of the body [ant: {distal}]
    
from The Collaborative International Dictionary of English v.0.48
Mesial \Me"sial\ (?; 277), a. [Gr. me`sos middle.] (Anat.)
   Middle; median; in, or in the region of, the mesial plane;
   internal; -- opposed to {lateral}.
   [1913 Webster]

   {Mesial plane}. (Anat.) See {Meson}.
      [1913 Webster]
    

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