Dictionary

vitamin D

vitamin D

noun

Definition of VITAMIN D

:  any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: as
a or vitamin D2 \-ˈdē-ˈtü\ :  calciferol
b or vitamin D3 \-ˈdē-ˈthrē\ :  cholecalciferol

First Known Use of VITAMIN D

circa 1921

vitamin D

noun    (Medical Dictionary)

Medical Definition of VITAMIN D

:  any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: as a :  calciferol b :  cholecalciferol—called also sunshine vitamin

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