a : something that is shaped by casting in a mildew or variety: including (one) : a reproduction (as of a statue) in steel or plaster : casting (two) : a fossil reproduction of the small print of the all-natural item by mineral infiltration b : an impression taken from an object that has a liquid or plastic substance : mildew They designed a mask from a wax cast of her confront.

: a mass of plastic matter go here formed in cavities of diseased organs (since the kidneys) and discharged from the human body

discard implies the allowing go or throwing absent of something that is becoming worthless or superfluous although typically not intrinsically valueless.