Definition of boron in US English:

boron

noun

  • The chemical element of atomic number 5, a nonmetallic solid.

    Boron is usually prepared as an amorphous brown powder, but when very pure it forms hard, shiny, black crystals with semiconducting properties. The element has some specialized uses, such as in alloy steels and nuclear control rods

    • ‘It was not until 1807, however, that Sir Humphrey Davy identified boron as a chemical element.’
    • ‘The immobile nutrients are iron, sulfur, calcium, manganese, copper, zinc, boron, molybdenum, and chlorine.’
    • ‘Each layer is doped with tiny amounts of different impurities, usually phosphorus and boron.’
    • ‘Besides hydrogen and its isotope deuterium, researchers use the isotopes of boron, oxygen, nitrogen and carbon.’
    • ‘The mineral elements most likely to be deficient in vineyards are nitrogen, potassium, phosphorus, zinc, boron, iron, manganese, and magnesium.’
    • ‘The smaller element may be a nonmetallic element, such as boron, carbon, nitrogen, or silicon.’
    • ‘They spray boron and energetic nitrogen atoms onto a clean, heated tungsten surface, held at 250 to 500 volts, in an ultrahigh vacuum.’
    • ‘Grain refinement by titanium, boron and zirconium additions has only a limited effect on mechanical properties.’
    • ‘The most widely used grain refiners are master alloys of titanium, or of titanium and boron, in aluminum.’
    • ‘Those with less than an octet are often called electron deficient and are typical of certain elements with an odd number of electrons, such as boron and nitrogen.’
    • ‘In addition, soy also contains magnesium and boron, which are important co-factors of calcium for bone health.’
    • ‘This product is a laundry aid containing sodium, boron, oxygen, and water.’
    • ‘Diffusion methods modify the chemical composition of the surface with hardening species such as carbon, nitrogen, or boron.’
    • ‘Trace minerals that are already more than adequate in most diets include phosphorus, iodine, manganese, chloride, molybdenum and boron.’
    • ‘Nitrogen, phosphorus, potassium, sulphur and boron have been found to be important in Zambia.’
    • ‘Electrons from the n-type half are drawn to the p-type half because of the way that phosphorus and boron bond with silicon.’
    • ‘Zinc is in solid solution; boron, titanium and zirconium are seldom added in amounts sufficient to produce visible compounds.’
    • ‘Nitrogen and boron are increasingly used in steels in small but significant concentrations.’
    • ‘These rare coloured stones are highly treasured; their coloration comes from traces of elements such as boron and nitrogen or from structural flaws in the crystal lattice.’
    • ‘In certain cases, small metallic atoms, like boron and beryllium, may enter into restricted interstitial solid solutions.’

Origin

Early 19th century: from borax, on the pattern of carbon (which it resembles in some respects).

Pronunciation

boron

/ˈbôrän//ˈbɔrɑn/