[1] : 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.
      1913 webster

            grind their bones to powder small.    --shak.
      1913 webster

   2. an explosive mixture used in gunnery, blasting, etc.;
      gunpowder. see gunpowder.
      1913 webster

   atlas powder, baking powder, etc. see under atlas,
      baking, etc.

   powder down zool., the peculiar dust, or exfoliation, of
      powder-down feathers.

   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
      scaly exfoliation.

   powder-down patch zool., a tuft or patch of powder-down
      feathers.

   powder hose, a tube of strong linen, about an inch in
      diameter, filled with powder and used in firing mines.
      --farrow.

   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.
      1913 webster
see also:
polverine pulverize gunpowder atlas powder baking powder atlas 
baking powder down powder-down feather powder-down patch powder hose 
powder hoy powder magazine powder room magazine powder mine 
mine powder monkey powder post dry rot dry 
powder puff puff 

[2] : WordNet (r) 2.0

powder room
     n : a woman's restroom in a public or semi-public building
         syn: ladies' room
see also:
ladies' room 

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Elbow Room, definition of term: Elbow Room
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Emergency Room, definition of term: Emergency Room
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Game Room, definition of term: Game Room
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Dressing Room >> D Words
Dressing Room, definition of term: Dressing Room
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Drawing Room, definition of term: Drawing Room
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Baking Powder >> B Words
Baking Powder, definition of term: Baking Powder
baking+powder_pag1.html

Dining Room >> D Words
Dining Room, definition of term: Dining Room
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Baby Powder >> B Words
Baby Powder, definition of term: Baby Powder
baby+powder_pag1.html