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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Recent Examples of boron from the Web
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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.
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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.
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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.
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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.
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Previous tests done by Marion County health officials showed elevated levels of boron in their well, but not above safe drinking water standards.
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For example, the glue in cardboard boxes and paper bags contains boron, an element that can inhibit plant growth at excessive levels.
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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.
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Other trace elements include iron, manganese, zinc, boron, molybdenum and chlorine.
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.
Origin and Etymology of boron
borax + -on (as in carbon)
BORON Defined for Kids
Definition of boron for Students
: a powdery or hard solid chemical element that is used especially in making glass and detergents
Medical Dictionary
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
Learn More about boron
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See words that rhyme with boron Nglish: Translation of boron for Spanish speakers Britannica.com: Encyclopedia article about boron
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