WordNet (r) 3.0 (2006):

chatterbox
    n 1: orchid growing along streams or ponds of western North
         America having leafy stems and 1 greenish-brown and pinkish
         flower in the axil of each upper leaf [syn: stream
         orchid, chatterbox, giant helleborine, Epipactis
         gigantea]
    2: an obnoxious and foolish and loquacious talker [syn:
       chatterer, babbler, prater, chatterbox, magpie,
       spouter]