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a sterol occurring in animal and plant tissues which on irradiation by ultraviolet rays converts to vitamin D2, a potent agent for the prevention of rickets, ergocalciferol.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
The most important of the D2 provitamins; ultraviolet irradiation converts ergosterol to lumisterol, tachysterol, and ergocalciferol; main sterol in yeast, ergot, and molds.
Farlex Partner Medical Dictionary © Farlex 2012
A crystalline sterol, C28H43OH, synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
The most important of the D2 provitamins; ultraviolet irradiation converts ergosterol to lumisterol, tachysterol, and ergocalciferol; main sterol in yeast.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
ergosterolA sterol found in fungal cell membranes which, when exposed to ultraviolet light, is converted into vitamin D2 (ergocalciferol) and to other, toxic, substances.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005