abaxial abaxial /æbˈæksiəl/

adjective

1. (biology) facing away from the axis of an organ or organism  ( abaxial , dorsal )
   (biology) facing away from the axis of an organ or organism
    The abaxial surface of a leaf is the underside or side facing away from the stem
   the abaxial surface of a leaf is the underside or side facing away from the stem