The Collaborative International Dictionary of English v.0.48:
Powder \Pow"der\, n. [OE. poudre, pouldre, F. poudre, OF. also
poldre, puldre, L. pulvis, pulveris: cf. pollen fine flour,
mill dust, E. pollen. Cf. Polverine, Pulverize.]
1. 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. --Shak.
2. An explosive mixture used in gunnery, blasting, etc.;
gunpowder. See Gunpowder.
Atlas powder, Baking powder, etc. See under Atlas,
Powder down (Zool.), the peculiar dust, or exfoliation, of
Powder-down feather (Zool.), one of a peculiar kind of
modified feathers which sometimes form patches on certain
parts of some birds. They have a greasy texture and a
Powder-down patch (Zool.), a tuft or patch of powder-down
Powder hose, a tube of strong linen, about an inch in
diameter, filled with powder and used in firing mines.
Powder hoy (Naut.), a vessel specially fitted to carry
powder for the supply of war ships. They are usually
painted red and carry a red flag.
Powder magazine, or Powder room. See Magazine, 2.
Powder mine, a mine exploded by gunpowder. See Mine.
Powder monkey (Naut.), a boy formerly employed on war
vessels to carry powder; a powder boy.
Powder post. See Dry rot, under Dry.
Powder puff. See Puff, n.