a. 1 Having no polarity 2 # (context chemistry physics English) Having no dipole 3 (context geometry English) Orthogonal under the polar pairing between the symmetric algebra of a vector space and its dual.
The Collaborative International Dictionary
Apolar \A*po"lar\, a. [Pref. a- + polar.] (Biol.) Having no radiating processes; -- applied particularly to certain nerve cells.