cholecalciferol
noun
cho·le·cal·cif·er·ol
ˌkō-lə-(ˌ)kal-ˈsi-fə-ˌrȯl
-ˌrōl
: a sterol C27H43OH that is a natural form of vitamin D found especially in fish, egg yolks, and fish-liver oils and is formed in the skin on exposure to sunlight or ultraviolet rays
called also vitamin D3
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Merriam-Webster unabridged
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