English
adaxial
From ad- + axial.
Proto-Indo-European *h₂éd ‘near, at’
Proto-Italic *ad ‘toward, to, on, up to, for’
Latin ad ‘to, towards’
English ad-
Today it means
adj On the side that is towards the axis or central line, usually on the upper side.
Language periods are conventional ranges, not dates for this word.
Etymograph / adaxial