bo·​ron | \ ˈbȯr-ˌän \

Definition of boron

: a trivalent metalloid element found in nature only in combination and used especially in glass and detergents — see Chemical Elements Table

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Other Words from boron

boronic \ bȯr-​ˈä-​nik \ adjective

Examples of boron in a Sentence

Recent Examples on the Web

Instead of a flimsy metal space-frame chassis, there's extensive use of boron steel in the chassis. Jonathan M. Gitlin, Ars Technica, "Volvo’s new V60 is proof the station wagon must never die," 17 Oct. 2018 The boron, which is encased by protective rock, heads miles underground to the lower mantle. Christopher Carbone, Fox News, "Extremely rare blue diamonds lurk deep in Earth's core," 2 Aug. 2018 Sharygin said that synthetic boron nitride, another mineral produced at insanely hot temperatures, is likely the only mineral that comes close to being as hard as a diamond. Kimberly Hickok, Fox News, "Mineral never seen on Earth found inside Russian meteorite," 2 Oct. 2018 Their greyish-blue features come from trace particles of boron, comparatively less rare than diamonds, caught up within these bonds. David Grossman, Popular Mechanics, "The Hope Diamond Formed At The Bottom of The Ocean," 2 Aug. 2018 Their striking blue hue, which is partly dependent on the amount of the element of boron the gem captures, is helping scientists to unlock the mysteries deep in the planet's core. Christopher Carbone, Fox News, "Extremely rare blue diamonds lurk deep in Earth's core," 2 Aug. 2018 The right pH and the organic matter help ensure that nutrients, particularly essential micronutrients like boron, are readily available. Kris Wetherbee, Good Housekeeping, "6 Things You Need To Know Before You Plant Broccoli This Fall," 22 Aug. 2016 For example, a few nitrogen atoms among a diamond’s millions of carbon atoms can make the rock appear yellow or brown, while blue diamonds have been besmirched with a few boron atoms. Gemma Tarlach, Discover Magazine, "20 Things You Didn't Know About ... Diamonds," 23 Mar. 2018 Lead, arsenic, boron, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, selenium, thallium, and uranium are among the chemicals and heavy metals listed with coal ash deposits. Grace Schneider, The Courier-Journal, "An Indiana county is paying a steep price for burying toxic coal ash," 18 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'boron.' 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 boron

1812, in the meaning defined above

History and Etymology for boron

borax + -on (as in carbon)

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Statistics for boron

Last Updated

13 Jan 2019

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Time Traveler for boron

The first known use of boron was in 1812

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More Definitions for boron


bo·​ron | \ ˈbȯr-ˌän \

Kids Definition of boron

: a powdery or hard solid chemical element that is used especially in making glass and detergents


bo·​ron | \ ˈbō(ə)r-ˌän, ˈbȯ(ə)r- \

Medical Definition of boron

: a trivalent metalloid element found in nature only in combination and used in metallurgy and in composite structural materials symbol B — see Chemical Elements Table

Other Words from boron

boronic \ bȯr-​ˈän-​ik, bōr-​ \ adjective

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More from Merriam-Webster on boron

Rhyming Dictionary: Words that rhyme with boron

Spanish Central: Translation of boron

Nglish: Translation of boron for Spanish Speakers Encyclopedia article about boron

Comments on boron

What made you want to look up boron? Please tell us where you read or heard it (including the quote, if possible).


tremendous in size, volume, or degree

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