A conductor by means of which an electric current is made to enter or leave an object, substance, or region. Cf. anode, n., cathode, n.

Medicine. An electrode applied to the body of a patient during electrotherapy. Now historical and rare.

(a) an electrode acting as the control (sense 5) in an experiment (rare); (b) an electrode used to control or modify the way a device behaves…

a very fine electrode, esp. one suitable for investigating the electrical activity of individual cells.

Medicine. A device consisting of an electrode with an insulated holder, used (in pairs) to deliver an electric shock to the heart or (now usually)…