Source : Webster's Revised Unabridged Dictionary (1913)

Smokeless powder \Smoke"less pow"der\
   A high-explosive gunpowder whose explosion produces little,
   if any, smoke.

Source : WordNet®

smokeless powder
     n : an explosive (trade name Ballistite) that burns with
         relatively little smoke; contains pyrocellulose and is
         used as a propellant [syn: {Ballistite}]