Hydantoic :: Hydantoic (a.) Pertaining to, or derived from, hydantoin. See Glycoluric..
Hydantoin :: Hydantoin (n.) A derivative of urea, C3H4N2O2, obtained from allantion, as a white, crystalline substance, with a sweetish taste; -- called also glycolyl urea..
Hydatid :: Hydatid (n.) A membranous sac or bladder filled with a pellucid fluid, found in various parts of the bodies of animals, but unconnected with the tissues. It is usually formed by parasitic worms, esp. by larval tapeworms, as Echinococcus and Coenurus. See these words in the Vocabulary..