Source : Webster's Revised Unabridged Dictionary (1913)

Stench \Stench\, n. [AS. stenc a strong smell, fr. stincan. See
   {Stink}, v. i.]
   1. A smell; an odor. [Obs.]

            Clouds of savory stench involve the sky. --Dryden.

   2. An ill smell; an offensive odor; a stink. --Cowper.

   {Stench trap}, a contrivance to prevent stench or foul air
      from rising from the openings of sewers, drains, etc.

Stench \Stench\, v. t.
   To stanch. [Obs.] --Harvey.

Stench \Stench\, v. t. [AS. stencan to emit a smell, fr. stincan
   to smell. See {Stench}, n.]
   To cause to emit a disagreeable odor; to cause to stink.
   [Obs.] --Young.

Source : WordNet®

stench
     n : a distinctive odor that is offensively unpleasant [syn: {malodor},
          {malodour}, {stink}, {reek}, {fetor}, {foetor}, {mephitis}]