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WordReference Random House Unabridged Dictionary of American English © 2024vitamin D, - Biochemistry, Nutritionany 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.
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