polymethyl meth-acrylate

polymethyl methacrylate

[pol-ee-meth-uhl]
noun Chemistry.
polymerized methyl methacrylate.

Origin:
1930–35; poly- + methyl

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WordNet
polymethyl methacrylate

noun
a transparent plastic used as a substitute for glass 
WordNet® 3.0, © 2006 by Princeton University.
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