formstone

English

Etymology

form +‎ stone

Noun

formstone (uncountable)

1. A plaster compound creating the trompe l'oeil appearance of rock.
   • 1985, Anne Tyler, The Accidental Tourist, Knopf, →ISBN, page 199:

     He turned into Singleton and found a block of row houses that gave a sense of having been skimped on. […] Most were covered in formstone, but the bricks of Number 16 had been painted a rubbery maroon.