I. -ˌtrōd noun
( -s )
Etymology: electr- + -ode
: a conductor (as a metallic substance or carbon) used to establish electrical contact with a nonmetallic portion of a circuit (as in an electrolytic cell, a storage battery, an electron tube, or an arc lamp) — see anode , cathode
II. noun
: an element in a semiconductor device (as a transistor) that emits or collects electrons or holes or that controls their movements