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- 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. A hormone precursor that contributes to the maintenance of normal levels of calcium and phosphorus in the blood.
- VITAMINS AND MINERALS