Viosterol meaning

vī-ŏstə-rôl, -rōl
Ergosterol activated by ultraviolet irradiation; vitamin D2 .
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A preparation of vitamin D2 obtained from ultraviolet irradiation of ergosterol, formerly used medicinally.
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Origin of viosterol

  • (ultra)vio(let) (ergo)sterol

    From American Heritage Dictionary of the English Language, 5th Edition