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Definition of niobium : A later name of columbium. See Columbium.

Synonyms:

atomic number 41, nota bene, Nb

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

Usage examples:

• And that, Mike happened to know, was the density of a cryotronic brain, which is 90 per cent liquid helium and 10 per cent tantalum and niobium, by volume. - "Unwise Child", Gordon Randall Garrett.