calciferol /(kăl*sĭf"ẽr*a̤l)/

cal·cif·er·ol

calciferol

n.
  1. 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.