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Definition of cobalt : 1. A commercial name of a crude arsenic used as fly poison.
2. A tough, lustrous, reddish white metal of the iron group, not easily fusible, and somewhat magnetic. Atomic weight 59. 1. Symbol Co.

Synonyms:

carbon monoxide gas, atomic number 27, Co, conscientious objector, carbon monoxide

cyan, cadet blue, robin's egg blue, peacock, navy, azure, lavender, aquamarine, cornflower, indigo, turquoise, midnight blue, marine blue, baby blue, ultramarine, powder blue, sapphire, blue

metal

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

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

Usage examples:

• " And here is where Captain Lewis, experimenting with some strange water he had found- with some cobalt and 'isonglass' in it- got very ill from it. - "The Young Alaskans on the Missouri", Emerson Hough.
• This globule may be examined for iron, cobalt, and nickel with the borax bead. - "The Elements of Blowpipe Analysis", Frederick Hutton Getman.
• The most majestic of mountains and the softest of summer clouds are to him but flat washes of cobalt, and the loveliest of dimples on the fairest of cheeks but a shadow- tone, and a high light made real by pats of indigo and vermilion. - "The Underdog", F. Hopkinson Smith.