Dictionaryer•gos•ter•olPronunciation: (ûr-gos'tu-rōl", -rôl), [key] —n. Biochem. a colorless, crystalline, water-insoluble sterol, C28H43OH, that occurs in ergot and yeast and that, when irradiated with ultraviolet light, is converted to vitamin D. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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