[ kal-sif-uh-rawl, -rol ]
/ kælˈsɪf əˌrɔl, -ˌrɒl /

noun Biochemistry.

a fat-soluble, crystalline, unsaturated alcohol, C28H43OH, occurring in milk, fish-liver oils, etc., produced by ultraviolet irradiation of ergosterol, and used as a dietary supplement, as in fortified milk.Also called vitamin D2.

Origin of calciferol

First recorded in 1930–35; calcif(erous) + (ergost)erol Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for calciferol


/ (kælˈsɪfərɒl) /


a fat-soluble steroid, found esp in fish-liver oils, produced by the action of ultraviolet radiation on ergosterol. It increases the absorption of calcium from the intestine and is used in the treatment of rickets. Formula: C 28 H 43 OHAlso: vitamin D 2

Word Origin for calciferol

C20: from calcif (erous + ergost) erol
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for calciferol


[ kăl-sĭfə-rôl′, -rōl′ ]


vitamin D2
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for calciferol


[ kăl-sĭfə-rôl′, -rōl′ ]

Any of several sterols that are forms of vitamin D, especially ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3). See more at vitamin D.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.