hydrogen chloride

noun

: a colorless pungent poisonous gas HCl that fumes in moist air and yields hydrochloric acid when dissolved in water

Examples of hydrogen chloride 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.
Chemicals such as chlorine gas, bromine vapor, hydrogen chloride, hydrogen bromide, nitrogen trichloride, particulate matter, and other compounds are believed to have been released into the air, the lawsuit alleges. Irene Wright, USA Today, 23 June 2026 Some of the hazardous substances that may be present in the smoke are fire retardants, hydrogen chloride, bromine compounds and hydrogen cyanide—a fatally toxic chemical asphyxiant in high enough doses. John Mac Ghlionn, Newsweek, 14 Jan. 2025 That same month, another quality assurance test showed that the incinerator’s equipment wasn’t providing accurate readings for hydrogen chloride. Christine Condon, Baltimore Sun, 14 Mar. 2024 Tests did not find vinyl chloride or hydrogen chloride in any homes. Brenda Goodman, CNN, 9 Mar. 2024 See All Example Sentences for hydrogen chloride

Word History

First Known Use

1869, in the meaning defined above

Time Traveler
The first known use of hydrogen chloride was in 1869

Browse Nearby Words

Cite this Entry

“Hydrogen chloride.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrogen%20chloride. Accessed 5 Jul. 2026.

Kids Definition

hydrogen chloride

noun
: a colorless sharp-smelling poisonous gas that is made up of hydrogen and chlorine and produces hydrochloric acid when dissolved in water

Medical Definition

hydrogen chloride

noun
: a colorless pungent poisonous gas HCl that fumes in moist air and yields hydrochloric acid when dissolved in water

More from Merriam-Webster on hydrogen chloride

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