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allantoin

[uh-lan-toh-in]
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noun Biochemistry, Pharmacology.
  1. a white powder, C4H6N4O3, 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.
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Origin of allantoin

1835–45; allanto(is) + -in2; so named because it is found in the fluid of the allantois
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for allantoin

allantoin

noun
  1. a substance derived from the secretions of snails and contained in some plants, used in skin care products and valued for its soothing properties
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Word Origin

C19: from allantois
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
allantoin in Medicine

allantoin

(ə-lăn′tō-ĭn)
n.
  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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.