vitamin D

vitamin D   n.  A fat-soluble vitamin occurring in several forms, especially vitamin D2 or vitamin D3, required for normal growth of teeth and bones, and produced in general by ultraviolet irradiation of sterols found in milk, fish, and eggs.

Main Entry: vitamin D
Function: noun
: any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and foundespecially 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

vitamin D n.
A fat-soluble vitamin occurring in several forms, especially vitamin D₂ or vitamin D₃, required for normal growth of teeth and bones, and produced in general by ultraviolet irradiation of sterols found in milk, fish, and eggs.