vitamin D

vitamin D
n.
1) biochem. nut any of the several fat-soluble, antirachitic vitamins D1, D2, D3, occurring in milk and fish-liver oils, esp. cod and halibut: essential for the formation of normal bones and teeth
Etymology: 1920–25
2) vitamin D1
biochem. nut a form of vitamin D obtained by ultraviolet irradiation of ergosterol Etymology: 1930–35
3) vitamin D2
biochem. nut calciferol Etymology: 1930–35
4) vitamin D3
biochem. nut a form of vitamin D, C27H43Ooccurring in fish-liver oils, that differs from vitamin D2 by slight structural differences in the molecule Also called cholecalciferol

From formal English to slang. 2014.

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