1. noun /paʊ.də(ɹ)/
a) The fine particles to which any dry substance is reduced by pounding, grinding, or triturating, or into which it falls by decay; dust.
Grind their bones to powder small.
b) An explosive mixture used in gunnery, blasting, etc.; gunpowder.
2. verb /paʊ.də(ɹ)/
a) To reduce to fine particles; to pound, grind, or rub into a powder; to comminute; to pulverize; to triturate.
to powder the hair.
b) To sprinkle with powder, or as with powder; to be sprinkle
A circling zone thou seest / Powdered with stars.
Wikipedia foundation.