1. a ship with a reinforced bow to break up ice and keep channels open for navigation

Similar word(s): iceboat

Definition categories: man–made, ship

2. a beginning that relaxes a tense or formal atmosphere

- he told jokes as an icebreaker

Definition categories: act, beginning, commencement, start

Sentences with icebreaker as a noun:

- The new college hallmates were awkward with each other at first, but after a game of charades as an icebreaker, they were laughing like old friends.