Source : Webster's Revised Unabridged Dictionary (1913)

Pitter \Pit"ter\, n.
   A contrivance for removing the pits from peaches, plums, and
   other stone fruit.

Pitter \Pit"ter\, v. i.
   To make a pattering sound; to murmur; as, pittering streams.
   [Obs.] --R. Greene.