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

Definition of allantoin in English:


[mass noun] Biochemistry
A crystalline compound formed in the nitrogen metabolism of many mammals (excluding primates).
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.

Definition of allantoin in:

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