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Definition of Smokeless powder
1. Noun. An explosive (trade name Ballistite) that burns with relatively little smoke; contains pyrocellulose and is used as a propellant.
Definition of Smokeless powder
1. Noun. An explosive, similar to gunpowder, consisting of nitrocellulose mixed with nitroglycerine or nitroguanidine; it burns with very little smoke. ¹
¹ Source: wiktionary.com