Medical Definition of cholecalciferol
: 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 D, vitamin D3
Seen and Heard
What made you want to look up cholecalciferol? Please tell us where you read or heard it (including the quote, if possible).