Synonyms for Medial (same or very similar meaning)
WordNet sense 1 (dividing an animal into right and left halves):
medianWordNet sense 2 (being in or directed toward the midline or mesial plane of the body):
mesialWordNet sense 3 (in or near a center or constituting a center; the inner area):
centralFrom the ODE community, based on WordNetadd/edit