the GNU version of the Collaborative International Dictionary of English
n. one of the forms of vitamin d, a fat-soluble vitamin that prevents rickets. It is an unsaturated alcohol, C28H43OH found in foods such as milk and fish liver oils. It is used as a dietary supplement in milk.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a fat-soluble vitamin that prevents rickets
Word Usage
"Exposure to UVB radiation from the sun causes a chemical reaction in skin cells that converts a form of cholesterol to a form of vitamin D called calciferol …"