English dictionary
xanthine
/'z/&/n/T//i/n/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine
Source: WordNet 3.0
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A white microcrystalline nitrogenous compound, C<sub>5</sub>H<sub>4</sub>O<sub>2</sub>N<sub>4</sub>, 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 evaporated to dryness with nitric acid. Xanthine is closely related to uric acid.
Source: webster1913