safety glass

safety glass (usually uncountable, plural safety glasses)

1. Any type of glass, such as toughened glass, laminated glass or wire mesh glass, with additional safety features that make it less likely to break, or less likely to pose a threat when broken.
   • 1960 September, “Inter-city diesel units for the Hull-Liverpool service of the N.E.R.”, in Trains Illustrated, page 561:

     Safety glass is fitted throughout.

• safety glasses