hydantoin
noun
hy·dan·to·in
| \ hī-ˈdan-tə-wən
\
\
Medical Definition of hydantoin
1
: a crystalline weakly acidic imidazole derivative C3H4N2O2 with a sweetish taste that is found in beet juice and used in organic synthesis
2
: a derivative of hydantoin (as phenytoin)