IPA: //ˈmɛsəli//
KK: /mɛsəli/
In a manner that relates to the middle or central part of something, especially in anatomical terms.
The surgeon made the incision mesally to access the underlying tissue.
The word 'mesally' is derived from 'mesal' (from Latin 'medialis', meaning middle) and the suffix '-ly' (meaning in a manner). Thus, 'mesally' refers to something done in a manner that is central or middle.
Think of 'middle' ('mesal') to remember that 'mesally' means something done in a central manner.