noun Chemistry.
a plastic polymer of ethylene used chiefly for containers, electrical insulation, and packaging.
Also called, British, polythene.

1935–40; poly- + ethylene

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World English Dictionary
polyethylene (ˌpɒlɪˈɛθɪˌliːn)
another name for polythene

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
polyethylene   (pŏl'ē-ěth'ə-lēn')  Pronunciation Key 
Any of various artificial resins consisting of many ethyl groups (CH2CH2) joined end to end or in branched chains. Polyethylenes are easily molded and are resistant to other chemicals. They can be repeatedly softened and hardened by heating and cooling, and are used for many purposes, such as making containers, tubes, and packaging.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The campaign rhetoric may be a thing seen through a roll of polyethylene,
  darkly, but the campaign issues are clear enough.
It is my opinion that ever one would it is a mixture of steroids and
  polyethylene glycol, a neuro toxin, clinical antifreeze.
The base layer of modern skis is made from a substance called
  ultra-high-molecular-weight polyethylene.
Then everybody put on polyethylene gloves and began touching.
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