Lacking axial extremities, as nerve cells

• Lacking + or -, electrically
• Like some nerve cells
• Like nerve cells with no radiating processes
• Lacking radiating processes, as nerve cells
• Lacking direction, electrically
• Lacking radiating appendages, as nerve cells
• Like hydra neurons
• Electrically balanced, in chemistry

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Apolar \A*po"lar\, a. [Pref. a- + polar.] (Biol.) Having no radiating processes; -- applied particularly to certain nerve cells.