English Reference

Word

polyethylene

Phoneticspoly·eth·yl·ene

US/ˌpɑˌɫiˈɛθəˌɫin/

UK/pˌɒlɪˈɛθɪlˌiːn/

Definition

n. a type of plastic that is very strong and flexible. It is used to make things like plastic bags, bottles, and containers.

n. a thermoplastic polymer derived from ethylene, characterized by high strength-to-density ratios and chemical inertness. It is the most widely produced synthetic polymer globally.

Examples

“The plastic bottle is made of polyethylene.”

“Most grocery bags are manufactured from low-density polyethylene because it is lightweight and durable.”

“Engineers often choose polyethylene for industrial applications due to its resistance to moisture and its ability to withstand extreme temperatures without degrading.”

Examples

simple

“The plastic bottle is made of polyethylene.”

contextual

“Most grocery bags are manufactured from low-density polyethylene because it is lightweight and durable.”

complex

“Engineers often choose polyethylene for industrial applications due to its resistance to moisture and its ability to withstand extreme temperatures without degrading.”

Real-World Examples

Common in science writing

“High-density polyethylene (HDPE), an ordinary plastic, packs even more hydrogen by mass than water, and, unlike water, it’s a solid, so you don’t have to worry about leaks.”
Ars Technica · 13 Aug 2026
“PET responded well to the alkaline treatment, but polyethylene and polypropylene initially produced less hydrogen.”
ScienceDaily · 31 Jul 2026

Etymology

From poly- + ethylene.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

ethyleneNounpolyethyleneNoun

This entry

Level
C1 · Advanced
Frequency
Occasional
Updated

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English Reference