chatterbox definitions WordNet (r) 3.0 (2005) n 1: orchid growing ... 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] Merriam Webster's noun Date: 1774 one who ... n. a talkative person. Collin's Cobuild Dictionary (chatterboxes) A chatterbox is someone who talks a lot. (INFORMAL) N-COUNT Moby ...