xanthin \xan"thin\, n. gr. xanqo`s yellow.
   1. same as xanthine.
      1913 webster

   2. chem. a yellow insoluble coloring matter extracted from
      yellow flowers; specifically, the coloring matter of
      madder. formerly written also xanthein.
      1913 webster

   3. chem. one of the gaseous or volatile decomposition
      products of the xanthates, and probably identical with
      carbon disulphide. obs.
      1913 webster xanthine
see also:
xanthine xanthein