roughcast Syllabification: (rough·cast)Pronunciation: /ˈrəfˌkast/Definition of roughcast noun plaster of lime, cement, and gravel, used on outside walls. adjective 1(of a building or part of a building) coated with roughcast:a plain stone building, roughcast and whitewashed 2(of a person) lacking refinement:she thought of the roughcast yeomen she would meet verb (past and past participle roughcast) [with object] coat (a wall) with roughcast:the walls were to have been roughcast at the entrance bayroughcast in other Oxford dictionaries Definition of roughcast in the British & World English dictionary