tetrafluoroethylene

tet·ra·fluo·ro·eth·yl·ene

[te-truh-floor-oh-eth-uh-leen, -flawr-, -flohr-]
noun Chemistry.
a colorless, water-insoluble, flammable gas, C 2 F 4 , used in the synthesis of certain polymeric resins, as Teflon.

Origin:
1930–35; tetra- + fluoro- + ethylene

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Encyclopedia Britannica
Encyclopedia

tetrafluoroethylene

a colourless, odourless, faintly toxic gas belonging to the family of organic halogen compounds; it is the starting material in the manufacture of polytetrafluoroethylene (q.v.), a valuable synthetic resin.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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00:10
Tetrafluoroethylene has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
given to using long words.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
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