What does "median" mean?

Median: (Zoöl.) 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.