noun a rude model; the rudimentary, unfinished form of a thing.
2. roughcast ·vt to form in its first rudiments, without revision, correction, or polish.
3. roughcast ·vt to mold without nicety or elegance; to form with asperities and inequalities.
4. roughcast ·vt to plaster with a mixture of lime and shells or pebbles; as, to roughcast a building.
5. roughcast ·noun a kind of plastering made of lime, with a mixture of shells or pebbles, used for covering buildings.