Vitamin D: Any of a group of fat-soluble alcohols important in calcium metabolism in animals to form strong Bones and teeth and prevent rickets and osteoporosis.

• 维生素D:一类脂溶性醇(麦角固醇、胆利钙醇、导钙素)的统称,在动物体内钙的代谢中具有重要功能,能使骨骼和牙齿健壮,并预防佝偻病和骨质疏松。