Source : WordNet®

diode
     n 1: a thermionic tube having two electrodes; used as a rectifier
          [syn: {rectifying tube}, {rectifying valve}]
     2: a semiconductor that consists of a p-n junction [syn: {semiconductor
        diode}, {junction rectifier}, {crystal rectifier}]

Source : Free On-Line Dictionary of Computing

diode
     
         A {semiconductor} device which
        conducts electric current 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)