1. Someone who engages in childish or meaningless conversation or verbal interchanges: Carl's aunt is a great prattler when she is with her fellow workers.
2. Conversation or verbal interchanges which tend to be idle and shallow: Once given a forum, the senator turned out to be a prattler, going on about what a wonderful member of the Senate he was.
3. A noise or sound that may be interpreted as incoherent and meaningless: Patricia's baby was quite a prattler and she was often entertained by her little boy.