CtroniCs> A semiConduCtor deviCe whiCh ConduCts eleCtriCCurrent run in one direCtion only. This is the simplest kind of semiConduCtor deviCe, it has two terminals and a single PN junCtion. One diode Can be used as a half-wave reCtifier or four as a full-wave reCtifier. (1995-03-14)