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(botany, zoology) Of a side that is facing away from the axis or central line, such as the underside of a leaf; or the back of an animal. quotations
The lobule margins, furthermore, are arched away from the lobe, with the consequence that (when fully inflated) the abaxial leaf surface forms the interior lining of the lobule.
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, page 7
(botany) Not in the axis. Applied to an embryo placed out of the axis of the seed. examples