Source : Webster's Revised Unabridged Dictionary (1913)

Typewriter \Type"writ`er\, n.
   1. An instrument for writing by means of type, a typewheel,
      or the like, in which the operator makes use of a sort of
      keyboard, in order to obtain printed impressions of the
      characters upon paper.

   2. One who uses such an instrument.

Source : WordNet®

typewriter
     n : hand-operated character printer for printing written
         messages one character at a time