Medial
Part of speech: adjective
Definition: Of or pertaining to a mean or average. Pertaining to the inside; closer to the midline.
Part of speech: noun
Definition: One or more letters that occur in the middle of a word. Any of various things that occur in the middle.
Mesial
Part of speech: adjective
Definition: pertaining to the middle line of the bodyFacing the side of a tooth which faces the middle of the jaw.