a : something that is fashioned by casting in a very mould or sort: for example (1) : a reproduction (as of the statue) in metallic or plaster : casting (two) : a fossil copy of the details of the purely natural object by mineral infiltration b : an impression taken from an item that has a liquid or plastic substance : mold They designed a mask from a wax cast of her face.
: a mass of plastic make a difference fashioned in cavities this website of diseased organs (since the kidneys) and discharged from the human body
discard implies the letting go or throwing absent of a thing that is becoming useless or superfluous though frequently not intrinsically valueless.