Pronunciation: (īs'brā"kur), [key]
1. Naut.a ship specially built for breaking navigable passages through ice.
2. an opening remark, action, etc., designed to ease tension or relieve formality: A mild joke can be a good icebreaker.
3. a tool or machine for chopping ice into small pieces.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.