Mē'sial, a.

(mē'zhal) (Synop., § 130), a. [Gr. μέσος, middle.] Middle.

Mesial plane (Anat.), a plane dividing the body longitudinally and symmetrically into two parts, the one on the right side, the other on the left side. Hence, mesial is sometimes used to signify directed toward, or facing, the mesial plane; as, the mesial aspect of an organ.