A noun "medial" represents one or more letters that occur in the middle of a word.

(mathematics) Of or pertaining to a mean or average.

Situated in or near the middle, pertaining to the inside or closer to the midline of an organ, pertaining to the middle layer of a blood vessel, pertaining to the media and/or areas of the wing next to it in entomology, in the middle of a word in phonetics, central in terms of a consonant's production, and closer to the addressee in linguistics.