Etymology
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Lucite 

1937, proprietary name (E.I. DuPont de Nemours and Co., Wilmington, Delaware, U.S.) for a solid, transparent plastic, from Latin luc(i)-, from stem of lucere "to shine" (from PIE *louk-eyo-, suffixed (iterative) form of root *leuk- "light, brightness").

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Plexiglas (n.)
1935, proprietary name (Röhm & Haas) for a substance also sold as Perspex and Lucite. Often written incorrectly as plexiglass.
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Perspex 
1935, trade name in Britain for what in the U.S. is called Plexiglas or Lucite, irregularly formed from Latin perspect-, past participle stem of perspicere "look through, look closely at" (see perspective).
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