ignitron


ignitron
ignitron [ig nī′trän΄]
n.
[ IGNI(TE) + (ELEC)TRON]
a type of mercury-arc rectifier tube having a mercury-pool cathode and a single graphite anode: when a current is passed through an igniter rod into the pool, the mercury vapor is ionized and an arc starts between the cathode and anode: used in resistance welders, the control equipment for much high-energy research apparatus, etc.

English World dictionary. . 2014.