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[ur-gos-tuh-rohl, -rawl] /ɜrˈgɒs təˌroʊl, -rɔl/
noun, Biochemistry
a colorless, crystalline, water-insoluble sterol, C 28 H 43 OH, that occurs in ergot and yeast and that, when irradiated with ultraviolet light, is converted to vitamin D.
1885-90; ergo-2 + sterol Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ergo-sterol


a plant sterol that is converted into vitamin D by the action of ultraviolet radiation. Formula: C28H43OH
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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ergo-sterol in Medicine

ergosterol er·gos·ter·ol (ûr-gŏs'tə-rôl', -rōl')
A crystalline sterol synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for ergo-sterol


a white crystalline organic solid of the molecular formula C28H44O belonging to the steroid family. It is found only in fungi (e.g, Saccharomyces and other yeasts and Claviceps purpurea, the cause of ergot, a fungal disease of cereal grasses) and is chemically related to cholesterol. Ergosterol is converted by ultraviolet irradiation into ergocalciferol, or vitamin D2, a nutritional factor that promotes proper bone development in humans and other mammals.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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