| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
xanthine xan·thine (zān'thēn', -thĭn)
n.
A yellowish-white crystalline purine base that is a precursor of uric acid and is found in blood, urine, and muscle tissue.
Any of several derivatives of this compound.
xanthine (zān'thēn', -thĭn) Pronunciation Key
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