Source : Webster's Revised Unabridged Dictionary (1913)

Breech \Breech\, n. [See {Breeches}.]
   1. The lower part of the body behind; the buttocks.

   2. Breeches. [Obs.] --Shak.

   3. The hinder part of anything; esp., the part of a cannon,
      or other firearm, behind the chamber.

   4. (Naut.) The external angle of knee timber, the inside of
      which is called the throat.

Breech \Breech\, v. t. [imp. & p. p. {Breeched}; p. pr. & vb. n.
   {Breeching}.]
   1. To put into, or clothe with, breeches.

            A great man . . . anxious to know whether the
            blacksmith's youngest boy was breeched. --Macaulay.

   2. To cover as with breeches. [Poetic]

            Their daggers unmannerly breeched with gore. --Shak.

   3. To fit or furnish with a breech; as, to breech a gun.

   4. To whip on the breech. [Obs.]

            Had not a courteous serving man conveyed me away,
            whilst he went to fetch whips, I think, in my
            conscience, he would have breeched me. --Old Play.

   5. To fasten with breeching.

Source : WordNet®

breech
     n : opening in the rear of the barrel of a gun where bullets can
         be loaded [syn: {rear of barrel}, {rear of tube}]