n. One who chats or talks to excess (especially a child).
The Century Dictionary and Cyclopedia
n. One who talks incessantly: applied chiefly to children.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an obnoxious and foolish and loquacious talker
n. 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
Word Usage
"As for her calling me "chatterbox" -- she always calls me that when she's been doing all the talking."