Definition: "Variciform" is a medical term that refers to a type of reproductive organ in mammals. These are usually found on the underside or back of an animal's body, including birds and some mammals, like ducks and geese. Varicosities are small, round, and painful veins that appear on the skin. They can be caused by varicose veins, which are blood vessels that form inside the veins in the legs. Varicose veins are common in people who have had a