From Longman Dictionary of Contemporary Englishbullet-proofˈbullet-ˌproof adjective PMWsomething that is bullet-proof is designed to stop bullets from going through it an inch-thick wall of bullet-proof glass
Examples from the Corpus
bullet-proof• Extra security staff are now being employed after the 20-strong gang smashed panes of bullet-proof glass in four animal pens.• There was a shadowy figure visible through the ironwork filigree and bullet-proof glass of the front door.• A bullet-proof glass screen sealed the public gallery and everyone entering the building was subjected to a body search.• Shopkeepers keep their riot-cladding drawn, opening narrow doors for customers, and the cash-registers and shotguns nestle behind bullet-proof glass.• Unix, which is about the same age, just isn't as bullet-proof, it says.• Later, two black bullet-proof Jaguar motor cars headed out of South London.• So close to the front not even Goebbels' bullet-proof limousine was safe. 