Definition of "hydantoin" [hy•dan•to•in]

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

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• "The following ingredients contain formaldehyde, may release formaldehyde or may break down into formaldehyde: 2-bromo-2-nitropropane-1,3-diol, Diazolidinyl urea, DMDM hydantoin, Imidazolidinyl urea, Quaternium 15, 3 1,4 dioxane 3. PHTHALATES"
• "The group says consumers can look out for ingredients that are likely to contain either of the chemicals, though, including: peg-100 stearate, sodium laureth sulfate, polyethylene and ceteareth-20, quaternium-15, DMDM hydantoin, imidazolidinyl urea, diazolidinyl urea and sodium hydroxymethoylglycinate. —"
• ": Synthetic fragrance, which can be highly irritating and are also a potential source of questionable sub-ingredients such as phthalates; formaldehyde-donor preservatives-such as diazolidinyl urea, DMD hydantoin, imidazolidinyl urea, and sodium hydroxymethylglycinate-which under certain circumstances of formulation and storage, these ingredients have the potential to release formaldehyde in very small amounts; and chemical sunscreens, such as oxybenzone and octyl methoxycinnamate, have safety concerns since many have been shown to have endocrine-disruption activity."