Definition of allantoin in English:


Line breaks: al¦lan|toin
Pronunciation: /əˈlantəʊɪn


[mass noun] Biochemistry
  • A crystalline compound formed in the nitrogen metabolism of many mammals (excluding primates).
    • A cyclic compound related to hydantoin; chemical formula: C4H6N4O3
    More example sentences
    • The active compounds are allantoin and rosmarinic acid.
    • Oftentimes, it is not the cortisol stimulating properties which are cited for their healing properties but some other biochemical agent such as allantoin in comfrey.
    • Comfrey contains allantoin, a natural substance that stimulates the growth of new skin cells.


mid 19th century: from allantois (because it was discovered in the allantoic fluid of cows) + -in1.

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a small amount; a little