| Mesial (a.) Middle; median; in, or in the region of, the mesial plane; internal; -- opposed to lateral. Thesaurus Entries average, betwixt and between, central, core, equatorial, equidistant, half-and-half, halfway, in medias res, in the mean, in the middle, interior, intermediary, intermediate, mean, medial, medially, median, mediocre, mediterranean, medium, mediumly, mesial, mezzo, mezzo-mezzo, mid, middle, middlemost, middling, midland, midmost, midships, midway, nuclear |