Breaker \Break"er\, n.

1. One who, or that which, breaks.

I'll be no breaker of the law. --Shak.

2. Specifically: A machine for breaking rocks, or for breaking coal at the mines; also, the building in which such a machine is placed.

3. (Naut.) A small water cask. --Totten.

4. A wave breaking into foam against the shore, or against a sand bank, or a rock or reef near the surface.

The breakers were right beneath her bows. --Longfellow.

Source: Webster's Revised Unabridged Dictionary (1913)