boric acid

noun (1)
bo·​ric acid | \ ˈbȯr-ik- How to pronounce boric acid (audio) \

Definition of boric acid

 (Entry 1 of 2)

: a white crystalline acid B(OH)3 obtained from its salts and used especially as a weak antiseptic and fire-retardant

boric oxide

noun (2)
variants: or less commonly boric anhydride

Definition of boric oxide (Entry 2 of 2)

: the trioxide B2O3 of boron obtained usually as a transparent glassy solid by fusing boric acid

Examples of boric acid in a Sentence

Recent Examples on the Web: Noun To make COFs, scientists link up certain carbon-containing molecules (boric acid, for example) via covalent bonds (in which atoms share electron pairs) into a porous crystalline powder. Jennifer Ouellette, Ars Technica, "Watch this paper doll do sit-ups thanks to new kind of “artificial muscle”," 21 July 2019 The site produces materials such as boric acid, sodium carbonate, sodium sulfate and several specialty forms of borax used in soaps and other industrial materials. Alejandra Reyes-velarde,, "Near earthquake epicenter in Trona, ‘it looks like a tornado went through’," 5 July 2019 The populations were tested for their level of resistance to three different insecticides: abamectin, boric acid, and thiamethoxam. Kelly Mayes, Science | AAAS, "Cockroaches may soon be unstoppable—thanks to fast-evolving insecticide resistance," 28 June 2019 It’s applied in the same manner as boric acid, with a manual duster. Joseph Truini, Popular Mechanics, "How to Get Rid of Termites," 8 Jan. 2019 The drugs can have too much or too little of an active ingredient, be substandard or expired, or contain poisons and contaminants such as floor wax, mercury, boric acid, paint or antifreeze. Sumathi Reddy, WSJ, "The Uphill Fight Against Fake Prescription Drugs," 8 Oct. 2018 Mix 1 tablespoon of boric acid powder ($13 for 1 pound, with 1 1/4 cups sugar. Caroline Picard, Good Housekeeping, "How to Get Rid of Ants," 9 May 2018 Yet just like its name suggests, boric acid can extremely dangerous, says Dr. Moore. Jazmine Polk,, "Women Are Using Roach Poison to Treat Chronic Bacterial Vaginosis. Here's What Ob-Gyns Say," 6 Feb. 2018 If the pH is off, boric acid suppositories from the natural food store can be helpful. Monique Judge, The Root, "Stop Sticking Fruit in Your Vagina," 15 Feb. 2018

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

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First Known Use of boric acid

Noun (1)

1825, in the meaning defined above

History and Etymology for boric acid

Noun (1)


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The first known use of boric acid was in 1825

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Cite this Entry

“Boric acid.” The Dictionary, Merriam-Webster Inc., Accessed 19 January 2020.

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More Definitions for boric acid

boric acid

bo·​ric acid | \ ˈbȯr-ik- \

Kids Definition of boric acid

: a weak acid containing boron used to kill germs

boric acid


Medical Definition of boric acid

: a white crystalline acid H3BO3 obtained from its salts and used especially as a weak antiseptic

called also boracic acid, orthoboric acid

Comments on boric acid

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to insert between existing elements

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