permastone
nounEtymology A genericization from a trade name of the 1940s, Perma-Stone, itself a proprialization from what had previously been a lexical gap affixation, perma- + stone.
1
Any superficial surface constructed to look like stonework, usually made of concrete or thin sheets of rock assembled over an existing surface.
- Near-synonym: formstone (broadly synonymous)
- Related terms
- cementacious, cementitious