Xanthin /(?)/

Xan·thin

Xanthin

n.
  1. same as xanthine.
  2. A yellow insoluble coloring matter extracted from yellow flowers; specifically, the coloring matter of madder. (Chem.)
  3. One of the gaseous or volatile decomposition products of the xanthates, and probably identical with carbon disulphide. (Chem.) [Obs.]