adaxial (not comparable)

1. (botany) On the side that is towards the axis or central line, usually on the upper side.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 4:

     {...}}it has been transformed, except in a few taxa where lobules are always explanate, into a galeate water-sac, which is formed wholly from the lobule, with the external surface from the adaxial leaf surface.

2. (developmental biology) adjacent to the axis, or in vertebrates the notochord.

   In zebrafish, the adaxial cells are precursors to the embryonic slow muscle fibers.

• abaxial

• Portuguese: adaxial