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Definition of boron : A nonmetallic element occurring abundantly in borax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10. 9. Symbol B.

Synonyms:

vitamin B complex, type B, atomic number 5, B, group B, vitamin B, barn, bacillus

fermium, iridium, copper, zinc, neon, arsenic, cerium, argon, beryllium, silver, polonium, bromine, promethium, platinum, antimony, radium, americium, chromium, sulfur, mendelevium, tellurium, calcium, europium, curium, technetium, praseodymium, magnesium, chlorine, fluorine, gold, nickel, oxygen, lithium, thallium, palladium, mercury, carbon, rhodium, xenon, berkelium, dysprosium, thulium, ruthenium, lutetium, germanium, nitrogen, manganese, molybdenum, krypton, uranium, phosphorus, tin, cadmium, terbium, cesium, lanthanum, niobium, hydrogen, scandium, potassium, rubidium, thorium, holmium, osmium, strontium, indium, iodine, neptunium, hafnium, helium, vanadium, sodium, bismuth, neodymium, rhenium, ytterbium, element, gallium, californium, nobelium, plutonium, titanium, einsteinium, lead, gadolinium, iron, cobalt, selenium, aluminum, yttrium, tungsten, silicon, astatine, actinium, tantalum, francium, barium, radon, zirconium, samarium, erbium, protactinium

emery, chlorite, peat, chalcedony, ozocerite, pyrite, chromite, fluorite, cryolite, silica, iolite, rhodonite, fool's gold, glauconite, silicate, pyroxene, lime, orthoclase, fluorspar, bauxite, pitchblende, obsidian, asbestos, crystal, corundum, mica, kaolinite, brookite, pumice, calcite, molybdenite, quartz, alabaster, mineral, selenite, lazurite, garnet, salt, graphite, vermiculite, gypsum, hornblende, magnesite, aragonite, diatomite, coal, clay, spar, coke, talcum, brimstone, barite, feldspar, quicklime, azurite, lignite

Usage examples:

• It has, however, an intense affinity for boron, and will even go through a carbon crucible to unite with it. - "An Introduction to Chemical Science", R.P. Williams.
• Recent developments indicate that the metal, boron, may play an important part in the metallurgy of various metals. - "The Economic Aspect of Geology", C. K. Leith.
• Boron is present in minute quantities in sea water. - "The Economic Aspect of Geology", C. K. Leith.