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单词 vitamin d
释义

WordReference Random House Unabridged Dictionary of American English © 2024
vitamin D, 
  1. 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.
  • 1920–25

vitamin D1, 
  1. a mixture of lumisterol and calciferol, obtained by ultraviolet irradiation of ergosterol.

vitamin D2, 
  1. calciferol.

vitamin D3, 
  1. a D vitamin, C27H43OH, occurring in fish-liver oils, that differs from vitamin D2 by slight structural differences in the molecule. Also called cholecalciferol. 

Collins Concise English Dictionary © HarperCollins Publishers::
vitamin D n ( pl D vitamins)
  1. any of the fat-soluble vitamins, including calciferol and cholecalciferol, occurring in fish-liver oils (esp cod-liver oil), milk, butter, and eggs: used in the treatment of rickets and osteomalacia
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