polyethylene

noun

poly·​eth·​yl·​ene ˌpä-lē-ˈe-thə-ˌlēn 

: a polymer of ethylene

especially : any of various partially crystalline lightweight thermoplastics (CH₂CH₂)_x that are resistant to chemicals and moisture, have good insulating properties, and are used especially in packaging and insulation

Examples of polyethylene in a Sentence

Recent Examples on the Web

The company specializes in making bottle capital from polyethylene terephthalate, also known as PET. —Emma Hall, Sacbee.com, 2 May 2026

Today, roughly half of the global ethylene and polyethylene supply is stranded, constrained, or directly affected by the halt to commercial shipping through the Strait of Hormuz — a crucial transit point for 20% of the world’s crude. —Susanne Rust, Los Angeles Times, 1 May 2026

Through a specialized molten salt treatment, the long polymer chains in polyethylene are broken down into fuel-grade molecules. —Mrigakshi Dixit, Interesting Engineering, 9 Apr. 2026

Store in a spray bottle for easy dispensing, but make sure the bottle can handle the acidity (such as a glass or high-density polyethylene bottle). —Sheila Kim, The Spruce, 8 Apr. 2026

Word History

Etymology

poly- + ethylene

First Known Use

1862, in the meaning defined above

Phrases Containing polyethylene

• polyethylene glycol

Rhymes for polyethylene

• acetylene
• adenosine
• amphetamine
• anthropocene
• antipyrine
• apomorphine
• apoprotein
• aquamarine
• arsphenamine
• azobenzene
• buprenorphine
• chlorobenzene

Kids Definition

polyethylene

noun

poly·​eth·​yl·​ene ˌpäl-ē-ˈeth-ə-ˌlēn 

: a lightweight plastic resistant to chemicals and moisture and used chiefly in packaging

Medical Definition

polyethylene

noun

poly·​eth·​yl·​ene ˌpäl-ē-ˈeth-ə-ˌlēn 

: a polymer of ethylene

especially : any of various lightweight thermoplastics (CH₂CH₂)_x that are resistant to chemicals and moisture and are used especially in packaging, insulation, surgical implants, prostheses, and tubing