noun Pharmacology.
a colorless, needlelike, crystalline compound, C 3 H 4 N 2 O 2 , used in the synthesis of pharmaceutical substances and resins.

1865–70; hyd(rogen) + (all)antoin

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World English Dictionary
hydantoin (haɪˈdæntəʊɪn)
a colourless odourless crystalline compound present in beet molasses: used in the manufacture of pharmaceuticals and synthetic resins. Formula: C3H4N2O2
[C20: from hyd(rogen + all)antoin product occurring in allantoic fluid]

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American Heritage
Medical Dictionary

hydantoin hy·dan·to·in (hī-dān'tō-ĭn)
A crystalline substance derived from urea or allantoin.

The American Heritage® Stedman's Medical Dictionary
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