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viosterol

[vahy-os-tuh-rawl, -rol]
noun Biochemistry.
  1. a vitamin D preparation produced by the irradiation of ergosterol.
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Origin of viosterol

(ultra)vi(olet) + (erg)osterol
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018