me·si·al /ˈmiziəl, si-/
(a.)中央的,中間的
me·si·al /-zəl, səl/ 形容詞
中生的,正中的,中間的,近中的
Me·sial a. 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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mesial
adj : being in or directed toward the midline or mesial plane of
the body [ant: distal]