You searched for: “bipolar needle electron
bipolar needle electron (s) (noun), bipolar needle electrons (pl)
An electrode consisting of two insulated wires inside a single cylinder with neither one acting as the reference electrode.

Variations in voltage can be noted between the areas that the wires touch.

This entry is located in the following units: bi-, bin-, bino-, bis- (page 8) electro-, electr-, electri- (page 2)