Source : Webster's Revised Unabridged Dictionary (1913)

Sweetener \Sweet"en*er\, n.
   One who, or that which, sweetens; one who palliates; that
   which moderates acrimony.

Source : WordNet®

sweetener
     n 1: something added to foods to make them taste sweeter [syn: {sweetening}]
     2: anything that serves as an enticement [syn: {bait}, {come-on},
         {hook}, {lure}]