Source : Webster's Revised Unabridged Dictionary (1913)

Median \Me"di*an\, a. [L. medianus, fr. medius middle. See
   {Medial}.]
   1. Being in the middle; running through the middle; as, a
      median groove.

   2. (Zo["o]l.) Situated in the middle; lying in a plane
      dividing a bilateral animal into right and left halves; --
      said of unpaired organs and parts; as, median coverts.

   {Median line}.
      (a) (Anat.) Any line in the mesial plane; specif., either
          of the lines in which the mesial plane meets the
          surface of the body.
      (b) (Geom.) The line drawn from an angle of a triangle to
          the middle of the opposite side; any line having the
          nature of a diameter.

   {Median plane} (Anat.), the mesial plane.

   {Median point} (Geom.), the point where the three median
      lines of a triangle mutually intersect.