Webster's Revised Unabridged Dictionary · 1913

Median

Median (mē"di*an) , adjective

[Latin medianus, from medius middle. See Medial.]

1.
Being in the middle; running through the middle; as, a median groove.
2.
(Zoology) 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.
Collocations (3)
Median line (Anatomy) , Any line in the mesial plane; specif., either of the lines in which the mesial plane meets the surface of the body. 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 (Anatomy) , the mesial plane.
Median point (Geometry) , the point where the three median lines of a triangle mutually intersect.

Median , noun

(Geometry) A median line or point.