boron

bo·ron  (bôrn, br-)

n. Symbol B

A soft, brown, amorphous or crystalline nonmetallic element, extracted chiefly from kernite and borax and used in flares, propellant mixtures, nuclear reactor control elements, abrasives, and hard metallic alloys. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See Table at element.

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[bor(ax) + (carb)on.]

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bo·ronic (b-rnk, bô-) adj.

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boron

Noun

Chem a hard almost colourless crystalline metalloid element that is used in hardening steel Symbol: B[bor(ax) + (carb)on]

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boron  (bôrn)

Symbol B

A shiny, brittle, black metalloid element extracted chiefly from borax. It is a good electrical conductor at high temperatures and a poor conductor at low temperatures. Boron is necessary for the growth of land plants and is used in the preparation of soaps, abrasives, and hard alloys. It is also used in the control rods of nuclear reactors as a neutron absorber. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See Periodic Table.

Thesaurus

Noun

1.

boron - a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder atomic number 5, B chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter borax - an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent kernite - a light soft mineral consisting of hydrated sodium borate in crystalline form; an important source of boron