a : something which is formed by casting in a very mold or form: such as (1) : a copy (as of a statue) in metal or plaster : casting (2) : a fossil replica of the main points of the normal object by mineral infiltration b : an impact taken from an item that has a liquid or plastic material : mildew They produced a mask from a wax cast of her face.
: a here mass of plastic make any difference fashioned in cavities of diseased organs (since the kidneys) and discharged from the body
discard indicates the permitting go or throwing away of something which happens to be useless or superfluous even though generally not intrinsically valueless.