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[uh-lan-toh-in] /əˈlæn toʊ ɪn/
noun, Biochemistry, Pharmacology.
a white powder, C 4 H 6 N 4 O 3 , produced by oxidation of uric acid and the major excretory product of purine degradation in many vertebrates: used medicinally to heal skin ulcers and in lotions, lipsticks, etc., for its soothing effect.
Origin of allantoin
1835-45; allanto(is) + -in2; so named because it is found in the fluid of the allantois Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for allantoin


a substance derived from the secretions of snails and contained in some plants, used in skin care products and valued for its soothing properties
Word Origin
C19: from allantois
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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allantoin in Medicine

allantoin al·lan·to·in (ə-lān'tō-ĭn)

  1. A substance present in allantoic fluid, amniotic fluid, and fetal urine.

  2. A crystalline oxidation product of uric acid produced in vertebrate purine metabolism and used medicinally to promote tissue growth.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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