A substance present in allantoic fluid, fetal urine, and elsewhere; also an oxidation product of uric acid and the end product of purine metabolism in animals other than humans and the other primates. SYN: 3-ureidohydantoin, cordianine, glyoxyldiureide.
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al·lan·to·in ə-'lan-tə-wən n a crystalline oxidation product C4H6N4O3 of uric acid used to promote healing of local wounds and infections
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al·lan·to·in (ə-lanґto-in) the diureide of glyoxylic acid, found in human allantoic fluid and fetal urine; it is also found in many plants, and as a urinary excretion product of purine metabolism in most mammals but not in humans or related primates. It is produced synthetically by the oxidation of uric acid for use as an astringent and keratolytic, often as a component of multi-ingredient dermatological preparations.Medical dictionary. 2011.