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. (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.