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n. A crystalline sterol, C28H43OH, synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.

n. The steroid precursor of vitamin D2. It is found in cell membranes of fungi, and is their functional equivalent of cholesterol. It is also found in the membranes of some protists.

n. a plant sterol that is converted into vitamin D by ultraviolet radiation.

n. a plant sterol that is converted into vitamin D by ultraviolet radiation

"In addition, and especially important to its effectiveness as a remedy for ulcers and running sores, it is a rich source of ergosterol, which is converted by the sun's ultraviolet rays into vitamin D."

steroid alcohol    sterol   

viosterol   

sterol    ergocalciferol