roughcast n a coarse plaster for the surface of external walls n a rough preliminary model v shape roughly v apply roughcast to roughcast a wall v hew roughly, without finishing the surface Usage(s) Oscar Hammerstein II, a bulky man with a friendly, roughcast face, kept his bright blue eyes fixed on the stage. There are no roughcast iron men on Michigan's 1947 squad. The tile-roofed, many-gabled single-family houses have roughcast beige exteriors, carefully tended gardens and little fences around every yard. Synonym(s) rough-hew