hydrofluoric acid

noun

hy·​dro·​flu·​or·​ic acid ˌhī-drō-ˈflȯr-ik  -ˈflu̇r- 

: an aqueous solution of hydrogen fluoride HF that is a weak poisonous acid, that attacks silica and silicates, and that is used especially in finishing and etching glass

Examples of hydrofluoric acid in a Sentence

Recent Examples on the Web

Yes, the Xenomorph circulatory system is filled with a lethal, extremely melty cocktail of sulphuric and hydrofluoric acid. —Richard Edwards, Space.com, 12 Aug. 2025

In 2018, the company leaked hundreds of gallons of hydrofluoric acid into a nearby river basin. —Tommy Greene, WIRED, 1 Oct. 2024

Removing them typically involves toxic reagents such as hydrofluoric acid, nitric acid, or sodium hydroxide. —IEEE Spectrum, 17 June 2024

The Torrance Refinery Action Alliance organized the rally and argued that safer alternatives exist, and that many of the refineries in California no longer use hydrofluoric acid. PBF Energy, which purchased the refinery in 2016, issued a statement Saturday rebutting the activists’ accusations. —Jaclyn Cosgrove, Los Angeles Times, 18 Feb. 2024

Word History

Etymology

International Scientific Vocabulary

First Known Use

1830, in the meaning defined above

Rhymes for hydrofluoric acid

• antacid
• placid

Kids Definition

hydrofluoric acid

noun

hy·​dro·​flu·​or·​ic acid ˌhī-drō-flu̇-ˌȯr-ik-  -flu̇-ˌär-ik- 

: a weak poisonous acid that is formed by dissolving hydrogen fluoride in water

Medical Definition

hydrofluoric acid

noun

hy·​dro·​flu·​or·​ic acid -ˌflu̇r-ik-  -ˌflōr- 

-ˌflȯr-

: an aqueous solution of hydrogen fluoride HF that is a weak poisonous acid, that resembles hydrochloric acid chemically but attacks silica and silicates, and that is used especially in finishing and etching glass