vitamin Dvitamin D3
any of several fat-soluble vitamins that are essential for increased absorption of calcium and phosphorus from the intestinal tract, found in fish-liver oils, milk, egg yolk, etc. or produced by irradiation of provitamins; specif.,: a deficiency of vitamin D tends to cause rickets
- , CHOH, produced by irradiation of a derivative of ergosterol
- , CHOH, produced by irradiation of a derivative of sitosterol
A fat-soluble vitamin occurring in several forms, especially vitamin D2 or vitamin D3, required for normal growth of teeth and bones, and produced in general by ultraviolet irradiation of sterols found in milk, fish, and eggs.
A white crystalline compound, C28H44O, produced by ultraviolet irradiation of ergosterol. Also called calciferol, ergocalciferol.
A colorless crystalline compound, C27H44O, found in fish-liver oils, irradiated milk, and all irradiated animal foodstuffs. It has essentially the same biological activity as vitamin D2. Also called cholecalciferol.