'Mesial plane' definitions:
Definition of 'Mesial plane'
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Mesial \Me"sial\ (?; 277), a. [Gr. me`sos middle.] (Anat.)
Middle; median; in, or in the region of, the mesial plane;
internal; -- opposed to lateral.
[1913 Webster]
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Mesial plane. (Anat.) See Meson.
[1913 Webster]
