allantoin /əˈlantəʊɪn/

a

I. noun [ mass noun]

1.
[Biochemistry] a crystalline compound formed in the nitrogen metabolism of many mammals (excluding primates).

●A cyclic compound related to hydantoin; chem. formula: C4H6N4O3.
– origin mid 19th cent.: from allantois (because it was discovered in the allantoic fluid of cows) + -in1.

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