polymethyl methacrylate

[pol-ee-meth-uhl]

pol·y·meth·yl methac·rylate

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

Origin:
1930–35; poly- + methyl
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Polymethyl methacrylate is always a great word to know.
So is melamine. Does it mean:
a white, crystalline, slightly water-soluble solid, C3N3(NH2)3, used chiefly in organic synthesis and in the manufacture of resins
a neutral crystalline substance, C2H7NO3S, obtained from bile
WordNet
polymethyl methacrylate

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