From the M-W Editors
1803
First Known Use of mesial
1803
Medical Dictionary
adjective
me·si·al
\ˈmē-zē-əl, -sē-\
Medical Definition of mesial
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
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