of cast-the act of one who casts or throws, as in fishing.-the act or process of making casts or impressions, or of shaping metal or plaster in a mold; the act or the process of pouring molten metal into a mold.-that which is cast in a mold; esp. the mass of metal so cast; as, a casting in iron; bronze casting.-the warping of a board.-the act of casting off, or that which is cast off, as skin, feathers, excrement, etc.