Plyglass
/ˈplʌɪˌɡlɑːs/ /ˈplʌɪˌɡlas/noun
A type of laminated glass consisting of two or more panes enclosing one or more hermetically sealed spaces, which may contain dry air or be filled with a translucent material like glass fibre.
- A trademark in the United Kingdom..
Origin
1950s; earliest use found in Architectural Review. From ply + glass, after plywood.