noun Biochemistry.

  1. 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.


  1. a plant sterol that is converted into vitamin D by the action of ultraviolet radiation. Formula: C 28 H 43 OH


  1. A crystalline sterol synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.
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