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: middle, median
: 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 sense 2
1803, in the meaning defined at sense 1
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: being or located in the middle or a median part
the mesial aspect of the metacarpal head
: situated in or near or directed toward the median plane of the body
the heart is mesial to the lungs
— compare distal sense 1b
: 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 sense 1c, proximal sense 1b
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