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vitamin D

any of the several fat-soluble, antirachitic vitamins D₁, D₂, D₃, occurring in milk and fish-liver oils, esp. cod and halibut, or obtained by irradiating provitamin D with ultraviolet light, essential for the formation of normal bones and teeth.

vitamin D₁,

a mixture of lumisterol and calciferol, obtained by ultraviolet irradiation of ergosterol.

vitamin D₂,

calciferol.

vitamin D₃,

a D vitamin, C₂₇H₄₃OH, occurring in fish-liver oils, that differs from vitamin D₂ by slight structural differences in the molecule. Also called cholecalciferol.

vitamin B complex

vitamin E