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a fat-soluble, crystalline, unsaturated alcohol, C 28 H 43 OH, 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.
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: C28H43OH Also vitamin D2
(kāl-sĭf’ə-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.


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  • Calciferous

    forming salts of calcium, especially calcium carbonate. containing calcium carbonate. Historical Examples Earthworms and their Allies Frank E. Beddard Elementary Zoology, Second Edition Vernon L. Kellogg Cave Regions of the Ozarks and Black Hills Luella Agnes Owen Rambles in Rome S. Russell Forbes adjective forming or producing salts of calcium, esp calcium carbonate

  • Calcific

    making or converting into salt of lime or chalk. adjective forming or causing to form lime or chalk

  • Calcification

    a changing into lime. Physiology. the deposition of lime or insoluble salts of calcium and magnesium, as in a tissue. Anatomy, Geology. a calcified formation. a soil process in which the surface soil is supplied with calcium in such a way that the soil colloids are always close to saturation. a hardening or solidifying; rigidity: […]

  • Calcified

    Physiology. to make or become calcareous or bony; harden by the deposit of calcium salts. Geology. to harden by deposition of calcium carbonate. to make or become rigid or intransigent, as in a political position. Contemporary Examples Jill Lepore on When Life Begins and Ends in ‘The Mansions of Happiness’ Malcolm Jones June 20, 2012 […]

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