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 baking powder
 發酵粉

 Pow·der n.
 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, 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.

 Bak·ing, n.
 1. The act or process of cooking in an oven, or of drying and hardening by heat or cold.
 2. The quantity baked at once; a batch; as, a baking of bread.
 Baking powder, a substitute for yeast, usually consisting of an acid, a carbonate, and a little farinaceous matter.
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 baking powder
      n : any of various powdered mixtures used in baking as a
          substitute for yeast