smokeless powder

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A relatively smoke-free propellant charge composed mainly of nitrocellulose, used in projectiles and small artillery rockets.

from the GNU version of the Collaborative International Dictionary of English.

• A high-explosive gunpowder whose explosion produces little, if any, smoke. It is usually based on guncotton.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An explosive, similar to gunpowder, consisting of nitrocellulose mixed with nitroglycerine or nitroguanidine; it burns with very little smoke.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an explosive (trade name Ballistite) that burns with relatively little smoke; contains pyrocellulose and is used as a propellant