What is the meaning of the word "xanthine"?

Definitions:

  1. A crystaline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid. copy to clipboard NOUN
    • Xanthine oxidase is an enzyme associated with the fat globule membrane in cow's milk. copy to clipboard
  2. A nitrogenous compound that belongs to the group of purine bases; derived from guanine and adenine and is a precursor to uric acid. copy to clipboard NOUN
    • In purine catabolism, xanthine is first converted to urate. copy to clipboard