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 xanthic acid
 黃原酸

 Xan·thic a.
 1. Tending toward a yellow color, or to one of those colors, green being excepted, in which yellow is a constituent, as scarlet, orange, etc.
 2. Chem. (a) Possessing, imparting, or producing a yellow color; as, xanthic acid.  (b) Of or pertaining to xanthic acid, or its compounds; xanthogenic.  (c) Of or pertaining to xanthin.
 Xanthic acid Chem., a heavy, astringent, colorless oil, C2H5O.CS.SH, having a pungent odor. It is produced by leading carbon disulphide into a hot alcoholic solution of potassium hydroxide. So called from the yellow color of many of its salts. Called also xanthogenic acid.
 Xanthic colors Bot., those colors (of flowers) having some tinge of yellow; -- opposed to cyanic colors.  See under Cyanic.
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 Xan·tho·gen·ic a.  Chem. Producing a yellow color or compound; xanthic.  See Xanthic acid, under Xanthic.
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 xanthic acid
      n : any of a class of unstable organic acids containing sulphur