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1) being or located in the middle or a median part <the \mesial aspect of the metacarpal head>
2) situated in or near or directed toward the median plane of the body <the heart is \mesial to the lungs> compare DISTAL (1b)
3) of, relating to, or being the surface of a tooth that is next to the tooth in front of it or that is closest to the middle of the front of the jaw compare DISTAL (1c), PROXIMAL (1b)
me·si·al·ly -ē adv
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adj.
1. medial.
2. relating to or situated in the median line or plane.
3. designating the surface of a tooth towards the midline of the jaw.
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me·si·al (meґze-əl) [Gr. mesos middle] on the side towards the center line of the dental arch.Medical dictionary. 2011.