MESIAL PLANE
\mˈiːzɪəl plˈe͡ɪn], \mˈiːzɪəl plˈeɪn], \m_ˈiː_z_ɪ__ə_l p_l_ˈeɪ_n]\
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An imaginary plane, divingthe head, neck, and trunk into similar halves, towards right and left. Every aspect towards this plane is mesial; and every aspect towards right or left is lateral; every lateral aspect being dextral or sinistral.
By Robley Dunglison