2 definitions found From WordNet (r) 2.0 [wn]: mesial adjective: being in or directed toward the midline or mesial plane of the body [ant: {distal}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Mesial \Me"sial\ (?; 277), adjective [Gr. me'sos middle.] (Anat.) Middle; median; in, or in the region of, the mesial plane; internal; -- opposed to {lateral}. {Mesial plane}. (Anat.) See {Meson}.

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