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 1.5]
calciferol, n. one of the D vitamins, routinely added to dairy products, essential for the deposition of calcium in bones. Also called ERGOCALCIFEROL, vitamin D2.