This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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• Wordscraper
• Wordosaur

n. Chiefly British Variant of polyethylene.

n. A light thermoplastic used in packaging etc.; polyethylene.

n. a lightweight thermoplastic; used especially in packaging and insulation

"They produced a waxy lump of what the British call polythene ."

synthetic resin   

polymethylene    polyethylene    polyethene   

gunny    glassine    passenger-cargo    granite-gray    flip-chart    release    compostable    eelskin    non-ip    fifty-pound