Source : Webster's Revised Unabridged Dictionary (1913)

Ping \Ping\, n. [Probably of imitative origin.]
   The sound made by a bullet in striking a solid object or in
   passing through the air.

Ping \Ping\, v. i. [imp. & p. p. {Pinged}; p. pr. & vb. n.
   {Pinging}.]
   To make the sound called ping.

Source : WordNet®

Ping
     n 1: a river in western Thailand; a major tributary of the Chao
          Phraya [syn: {Ping River}]
     2: a sharp high-pitched resonant sound (as of a sonar echo or a
        bullet striking metal)

Source : Free On-Line Dictionary of Computing

ping
     
        {Packet InterNet Groper}