The Collaborative International Dictionary of English v.0.48:

Prattle \Prat"tle\, n.
   Trifling or childish tattle; empty talk; loquacity on trivial
   subjects; prate; babble.
   [1913 Webster]

         Mere prattle, without practice.          --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Prattle \Prat"tle\, v. i. [imp. & p. p. Prattled; p. pr. & vb.
   n. Prattling.] [Freq. of prate.]
   To talk much and idly; to prate; hence, to talk lightly and
   artlessly, like a child; to utter child's talk.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Prattle \Prat"tle\, v. t.
   To utter as prattle; to babble; as, to prattle treason.
   --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prattle
    n 1: idle or foolish and irrelevant talk [syn: prate,
         prattle, idle talk, blether, chin music]
    v 1: speak (about unimportant matters) rapidly and incessantly
         [syn: chatter, piffle, palaver, prate, tittle-
         tattle, twaddle, clack, maunder, prattle, blab,
         gibber, tattle, blabber, gabble]