ˈsafety glass noun [uncountable] strong glass that breaks into very small pieces that are not sharp, used, for example, in car windows
[TahlilGaran] Dictionary of Contemporary English ▲
safety glass n. Two panes of glass with a sheet of plastic between them so that the glass will not break into pieces.
Safety glass is used in cars because it does not break into pieces. [TahlilGaran] English Idioms Dictionary ▲