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(n.) A complex nitrogenous substance related to urea and uric acid, produced as a white powder; - so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine.
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Webster, Noah. Entry for 'Xanthinine'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/x/xanthinine.html. 1828.