in medicine, a device such as a small metal plate or needle that carries electricity from an instrument to a patient for treatment or surgery. electrodes can also carry electrical signals from muscles, brain, heart, skin, or other body parts to recording devices to help diagnose certain conditions.
電極
正の電極
反対の電極
in electricity, a carbon point
the negative pole
陽極.
電極が存在しないこと
the electrode in a transistor where electrons originate