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An oxidation product of uric acid, C4H6N4O3, found in the urine of most mammals (except humans and related primates) as the metabolic end product of purine oxidation, and also found in some plants. It is also produced synthetically and is often used in cosmetics and pharmaceuticals.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) a substance derived from the secretions of snails and contained in some plants, used in skin care products and valued for its soothing properties
[C19: from allantois]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(əˈlæn toʊ ɪn)

a white powder, C4H6N4O3, produced by oxidation of uric acid: used as an emollient.
[1835–45; allanto (is) + -in1; so named because it is found in the fluid of the allantois]
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