Source : Webster's Revised Unabridged Dictionary (1913)

Terminator \Ter"mi*na`tor\, n. [L., he who limits or sets
   bounds.]
   1. One who, or that which, terminates.

   2. (Astron.) The dividing line between the illuminated and
      the unilluminated part of the moon.

Source : WordNet®

terminator
     n : someone who exterminates (especially someone whose
         occupation is the extermination of troublesome rodents
         and insects) [syn: {exterminator}, {eradicator}]

Source : Free On-Line Dictionary of Computing

terminator
     
         A resistor connected to a signal wire in a {bus}
        or {network} for the purpose of impedance matching to prevent
        reflections.
     
        For example, a 50 ohm resistor connected across the end of an
        {Ethernet} cable.  {SCSI} chains and some {LocalTalk} wiring
        schemes also require terminators.
     
        (1995-05-17)