ergosterol

ergosterol

[ur-gos-tuh-rohl, -rawl]
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.

Origin:
1885–90; ergo-2 + sterol

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Collins
World English Dictionary
ergosterol (ɜːˈɡɒstəˌrɒl)
 
n
a plant sterol that is converted into vitamin D by the action of ultraviolet radiation. Formula: C28H43OH

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ergosterol er·gos·ter·ol (ûr-gŏs'tə-rôl', -rōl')
n.
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 Britannica
Encyclopedia

ergosterol

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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