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Webster 1913 Edition

Noun.

[

Hyd

rogen + all

antion

(Chem.)

A derivative of urea,

C3H4N2O2

, obtained from allantion, as a white, crystalline substance, with a sweetish taste; – called also

glycolyl urea

hydantoin ‎(plural hydantoins)

(organic chemistry) The heterocycle imidazolidine-2,4-dione derived from urea and glycolic acid; any of its many derivatives