medial

Short definition from Wiktionary

Adjective

1. 1
   Of or pertaining to a mean or average.
2. 2
   Situated in or near the middle; not at either end: Pertaining to the inside; closer to the median plane of the body or the midline of an organ.
3. 3
   Situated in or near the middle; not at either end: Pertaining to the middle layer of a blood vessel, to its tunica media.
4. 4
   Situated in or near the middle; not at either end: Of or pertaining to the media and/or the areas of the wing next to it.
5. 5
   Situated in or near the middle; not at either end: (of a speech sound, or a character or sequence thereof) In the middle of a word.
6. 6
   Situated in or near the middle; not at either end: (of a consonant) Central: produced when air flows across the center of the mouth over the tongue.
7. 7
   Situated in or near the middle; not at either end: Closer to the addressee.

Noun

1. 1
   Any of various things that occur in the middle.
2. 2
   Any of various things that occur in the middle: One or more letters that occur in the middle of a word.