powder

n. 1 mass of fine dry particles. 2 medicine or cosmetic in this form. 3 = *gunpowder. v. 1 apply powder to. 2 (esp. As powdered adj.) Reduce to a fine powder (powdered milk).  powdery adj. [latin pulvis -ver- dust]

n. The fine particles to which any dry substance is reduced by pounding, grinding, or triturating, or into which it falls by decay; dust.