the fine particles to which any dry substance is reduced by pounding, grinding, or triturating, or into which it falls by decay; dust.-an explosive mixture used in gunnery, blasting, etc.; gunpowder. see gunpowder.-to reduce to fine particles; to pound, grind, or rub into a powder; to comminute; to pulverize; to triturate.-to sprinkle with powder, or as with powder; to be sprinkle; as, to powder the hair.-to sprinkle with salt; to corn, as meat.-to be reduced to powder; to become like powder; as, some salts powder easily.-to use powder on the hair or skin; as, she paints and powders.