'chatterbox' definitions:

Definition of 'chatterbox'

(from WordNet)
noun
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]
noun
An obnoxious and foolish and loquacious talker [syn: chatterer, babbler, prater, chatterbox, magpie, spouter]

Synonyms of 'chatterbox'

From: Moby Thesaurus