cyanuric acid


cy·​an·​uric acid ˌsī-ə-ˈnu̇r-ik- How to pronounce cyanuric acid (audio)
: a crystalline weak acid C3N3(OH)3 that yields cyanic acid when heated

Example Sentences

Recent Examples on the Web This tests for seven parameters: total hardness, total chlorine, bromine, free chlorine, pH, cyanuric acid, and total alkalinity. Chris Hachey, BGR, 25 May 2021 It must be used more frequently than chlorine tablets, however, and experts recommend using it in tandem with cyanuric acid as a stabilizer. Emma Stein, Detroit Free Press, 4 June 2021 Testing for free chlorine, total chlorine, bromine, total hardness, total alkalinity, pH and cyanuric acid is made easy with these strips. Chris Hachey, BGR, 25 May 2021 After several years, the researchers homed in on a few promising candidates, most notably two molecules, triaminopyrimidine (TAP) and cyanuric acid (CA). Quanta Magazine, 5 Feb. 2014

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cyanuric acid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History


cyan- + urea

First Known Use

1838, in the meaning defined above

Time Traveler
The first known use of cyanuric acid was in 1838

Dictionary Entries Near cyanuric acid

Cite this Entry

“Cyanuric acid.” Dictionary, Merriam-Webster, Accessed 2 Feb. 2023.

Medical Definition

cyanuric acid

cy·​an·​uric acid ˌsī-ə-ˌn(y)u̇r-ik- How to pronounce cyanuric acid (audio)
: a crystalline weak acid C3H3N3O3 used especially in swimming pools to protect the available chlorine from dissipation by sunlight
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