ethylene oxide

noun

: a colorless flammable toxic compound C2H4O used especially in synthesis (as of ethylene glycol) and in sterilization and fumigation

Examples of ethylene oxide in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Environmental groups are suing President Donald Trump and his administration in federal court over their moves to exempt medical sterilization facilities using the toxic gas ethylene oxide in Georgia and other states from tighter air emissions standards. Drew Kann, AJC.com, 28 Jan. 2026 In 2023, researchers who conducted their own air monitoring in the industrial corridor of Louisiana known as Cancer Alley found much higher concentrations of ethylene oxide than expected. Lisa Song, ProPublica, 7 Jan. 2026 The rules that facilities are exempt from complying with include those aimed at reducing releases of ethylene oxide — a cancer-causing gas used in sterilization and chloroprene — which is used to make neoprene and is considered a likely carcinogen by the Environmental Protection Agency (EPA). Rachel Frazin, The Hill, 22 Oct. 2025 Higher autism severity scores and weaker daily living skills were also linked with ethylene oxide. Sharon Lerner, CNN Money, 22 Aug. 2025 See All Example Sentences for ethylene oxide

Word History

First Known Use

1866, in the meaning defined above

Time Traveler
The first known use of ethylene oxide was in 1866

Browse Nearby Words

Cite this Entry

“Ethylene oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ethylene%20oxide. Accessed 14 Feb. 2026.

Medical Definition

ethylene oxide

noun
: a colorless flammable toxic gaseous or liquid compound C2H4O used especially in synthesis (as of ethylene glycol) and in fumigation and sterilization (as of medical instruments)

More from Merriam-Webster on ethylene oxide

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster