Plexiglas Printable version

A clear acrylic sheetgood. Name is a derivative of "Plastic Glass." Another genericized trademark.
According to this site, Plexiglass Sheet, Acrylic Sheets, Plastic Displays, Fabrication

Plexiglass is the common name for Acrylic. Plexiglas® is a brand of Plexiglass sheet.

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So two s's is the generic, one s is the brand name.

See also Lexan, Lucite.