a combining form extracted from electron, used with nouns or combining forms, principally in the names of electron tubes (ignitron; klystron; magnetron) and of devices for accelerating subatomic particles (cosmotron; cyclotron); also, more generally, in the names of any kind of chamber or apparatus used in experiments (biotron).
by initial shortening of electron, with perhaps accidental allusion to the Gk instrumental suffix -tron, as in árotron plough
jargon (NRL, CMU, probably from the film "Tron") To become inaccessible except via electronic mail or talk especially when one is normally available via telephone or in person. Compare spod. [Jargon File] (1994-11-03)