Source : Webster's Revised Unabridged Dictionary (1913)

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 : WordNet®

breaker
     n 1: a quarry worker who splits off blocks of stone [syn: {ledgeman}]
     2: waves breaking on the shore [syn: {surf}, {breakers}]
     3: a device that trips like a switch and opens the circuit when
        overloaded [syn: {circuit breaker}]