Nautical A sturdy ship built for breaking a passage through icebound waters. Also called iceboat.
A protective pier or dock apron used as a buffer against floating ice.
Something done or said to relax an unduly formal atmosphere or situation.
A beginning; a start.
icebreaker security, jargon A program designed for cracking security on a system. See also: ICE. [The Jargon File] (2000-03-18)