The Collaborative International Dictionary
Paraxanthin
Paraxanthin \Par`a*xan"thin\, n. [Pref. Para- + xanthin.] (Physiol. Chem.) A crystalline substance closely related to xanthin, present in small quantity in urine.
Wiktionary
paraxanthin
n. (context organic compound English) A crystalline substance closely related to xanthin, present in small quantities in urine.