1. 
   Xanthin
   Xan'thin noun [ Greek xanqo`s yellow.] 1. (Physiol. Chem.) A crystalline nitrogenous body closely related to both uric acid and hypoxanthin, present in muscle tissue, and occasionally found in the urine and in some urinary calculi...
   Found op http://www.encyclo.co.uk/webster/X/1
   
   
2. 
   xanthin
   1. <physiology> A crystalline nitrogenous body closely related to both uric acid and hypoxanthin, present in muscle tissue, and occasionally found in the urine and in some urinary calculi. It is also present in guano. So called from the yellow colour of certain of its salts (nitrates). ... 2. ...
   Found op http://www.mondofacto.com/facts/dictionary?xanthin
   
   
3. 
   Xanthin
   • A white microcrystalline nitrogenous compound, C5H4O2N4, present in muscle tissue, in the liver, spleen, pancreas, and other organs, and also in urine (in small quantities) and some urinary calculi, and in the juices of certain plants; -- so called because it leaves a yellow residue when evap...
   Found op http://thinkexist.com/dictionary/meaning/xanthin/
   
   
4. 
   Xanthin
   Xanthin is an insoluble yellow colouring matter extracted from yellow flowers, and specifically applied to the colouring matter of the madder flower.
   Found op http://www.probertencyclopaedia.com/browse/AX.HTM
   
   

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