boron

noun

bo·​ron ˈbȯr-ˌän 

: a metalloid chemical element that is found in nature only in combination and that is used especially in borosilicate glass and detergents see Chemical Elements Table

boronic

bȯr-ˈä-nik 

adjective

Examples of boron in a Sentence

Recent Examples on the Web

Neodymium-iron-boron (NdFeB) magnets are used in virtually anything that moves. —Jordan Blum, Fortune, 17 Nov. 2025

The Hers solution includes cranberry extract for urinary tract health and hyaluronic acid for hair, skin and nail support, while the Hims solution also employs lycopene for prostate health and boron for hormonal and bone support. —Emily Burns, Footwear News, 12 Nov. 2025

Until recently, scientists could consistently produce nanotubes from carbon—capable of acting as semiconductors or semimetals—and from boron nitride, an insulator. —Jijo Malayil, Interesting Engineering, 9 Nov. 2025

The analyst added that these permanent magnets use elements such as samarium-cobalt and neodymium-iron-boron molecules or yttrium, a rare earth metal used to prevent corrosion. —Lisa Kailai Han, CNBC, 13 Oct. 2025

Word History

Etymology

borax + -on (as in carbon)

First Known Use

1812, in the meaning defined above

Phrases Containing boron

• boron carbide

Rhymes for boron

• anton
• argon
• axon
• baronne
• baryon
• baton
• buisson
• bygone
• capon
• cardon
• chiffon
• coupon

Kids Definition

boron

noun

bo·​ron ˈbō(ə)r-ˌän 

ˈbȯ(ə)r-

: a metalloid element found in nature only in combination (as in borax) see element

Medical Definition

boron

noun

bo·​ron ˈbō(ə)r-ˌän, ˈbȯ(ə)r- 

: 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

boronic

bȯr-ˈän-ik, bōr- 

adjective