ADJ.
abaxial, abnormal, axial, normal
AB- + NOUN
sorb
prefix
From.
ab- + sorb → absorb
Away from; outside of.
ab- + normal → abnormal
ab- + axial → abaxial
A unit of electromagnetic charge in the centimeter-gram-second system: the abcoulomb.
i Register
In some senses, ab- is marked as idiomatic. Watch for register when choosing this word.