R0319100 (rŭf′kăst′)n.1. A coarse plaster of lime, shells, and pebbles used for outside wall surfaces.2. A rough preliminary model or form.tr.v.rough·cast, rough·cast·ing, rough·casts1. To plaster (a wall, for example) with roughcast.2. To shape or work into a rough or preliminary form.rough′cast′er n. EncyclopediaSeeroughcast