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1. (n.) vitamin D
any of the several fat-soluble, antirachitic vitamins D
2. (n.) vitamin D
a form of vitamin D obtained by ultraviolet irradiation of ergosterol.
3. (n.) vitamin D
a form of vitamin D, C
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| Definition of 'vitamin d' |
Princeton's WordNet |
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1. (noun) vitamin D, calciferol, viosterol, ergocalciferol, cholecalciferol, D
a fat-soluble vitamin that prevents rickets
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| Definition of 'vitamin d' |
U.S. National Library of Medicine |
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1. vitamin d
A vitamin that includes both CHOLECALCIFEROLS and ERGOCALCIFEROLS, which have the common effect of preventing or curing RICKETS in animals. It can also be viewed as a hormone since it can be formed in SKIN by action of ULTRAVIOLET RAYS upon the precursors, 7-dehydrocholesterol and ERGOSTEROL, and acts on VITAMIN D RECEPTORS to regulate CALCIUM in opposition to PARATHYROID HORMONE.
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Definitions of vitamin d 
