Definition of hydantoin in English:


Line breaks: hy|dan¦toin
Pronunciation: /hʌɪˈdantəʊɪn


  • A crystalline compound present in sugar beet and used in the manufacture of some anticonvulsant drugs.
    • A cyclic derivative of urea; chemical formula: C3H4N2O2
    More example sentences
    • Drugs that have been implicated include penicillin, aminopenicillins, sulfonamides, allopurinol, thiazides, quinolones, hydantoins, and propylthiouracil.
    • They were working to create antimicrobial coatings by incorporating a molecule called hydantoin into fluorine-containing polymer chains.


mid 19th century: from Greek hudōr 'water' + allantoic (see allantois) + -in1.

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