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

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 Groundwater monitoring The department, at the request of a commenter, added boron to the list of contaminants that must be monitored at CCR sites and increased the required background monitoring. Dennis Pillion,, "Alabama passed state coal ash rules: What's in them?," 25 Apr. 2018 All three types of crystals that the team studied—calcite, a form of calcium carbonate; cordierite, an iron- and magnesium-rich silicate; and tourmaline, a boron-rich silicate—worked well at intervals of 3 hours or less. Sid Perkins, Science | AAAS, "Viking seafarers may have navigated with legendary crystals," 3 Apr. 2018 Previous tests done by Marion County health officials showed elevated levels of boron in their well, but not above safe drinking water standards. Sarah Bowman, Indianapolis Star, "New reports: Contaminants from coal ash at levels 40 times above safe drinking water standards," 28 Mar. 2018 For example, the glue in cardboard boxes and paper bags contains boron, an element that can inhibit plant growth at excessive levels. Kym Pokorny,, "Sweep wood ash from the fireplace to the garden," 20 Mar. 2018 If there are direct pathways, the health effects are certain: The damage that arsenic, boron, chromium, and radon can do to humans is well-established in scientific literature. Emily Atkin, The New Republic, "Is Coal Waste Leaching Into America’s Drinking Water?," 12 Mar. 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

6 Oct 2018

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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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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).


evasion of direct action or statement

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