polyethylene
noun/ˌpɑliˈɛθəˌliːn/
Frequency rank: #13,488 most common English word
Meaning
a lightweight, durable thermoplastic polymer made from ethylene, widely used in packaging, containers, and films.

Example sentence
The bottles in our recycling bin are made of polyethylene, which is one of the most common plastics in the world.
Synonyms & related words
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