Source : Webster's Revised Unabridged Dictionary (1913)

Phonograph \Pho"no*graph\, n. [Phono- + -graph.]
   1. A character or symbol used to represent a sound, esp. one
      used in phonography.

   2. (Physics) An instrument for the mechanical registration
      and reproduction of audible sounds, as articulate speech,
      etc. It consists of a rotating cylinder or disk covered
      with some material easily indented, as tinfoil, wax,
      paraffin, etc., above which is a thin plate carrying a
      stylus. As the plate vibrates under the influence of a
      sound, the stylus makes minute indentations or undulations
      in the soft material, and these, when the cylinder or disk
      is again turned, set the plate in vibration, and reproduce
      the sound.

Source : WordNet®

phonograph
     n : machine in which rotating records cause a stylus to vibrate
         and the vibrations are amplified acoustically or
         electronically [syn: {record player}]