GNU Collaborative International Dictionary of English

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Found one definition

1.       
   icebreaker n.
   1. a ship with a reinforced bow and powerful engines designed to break up layers of ice on waterways and keep channels open for navigation.
   
   Syn. -- iceboat.
   
   [WordNet 1.5]
   
   
   2. A remark or action intended to relieve tension or reduce formality when initiating conversation or beginning a speech; it is often a humorous or light remark.
   
   [PJC]