/ Dictionary / Index V viosterol: Meaning and Definition of Find definitions for: vi•os•ter•ol Pronunciation: (vī-os'tu-rôl", -rol"), [key] — n. Biochem. a vitamin D preparation produced by the irradiation of ergosterol. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: viosterol (Thesaurus) violone Viotti Related Content Daily Word Quiz: hinder Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language