单词	cobalt
释义	cobaltco‧balt /ˈkəʊbɔːlt $ ˈkoʊbɒːlt/ noun [uncountable] Word Origin WORD ORIGINcobalt Origin: 1600-1700 German kobalt, from kobold ‘goblin’; because goblins were thought to mix it in with silver found in the ground Examples EXAMPLES FROM THE CORPUS During irradiation, food is exposed to gamma rays from sources such as cobalt 60 or cesium 137. In modern commercial synthesis graphite is mixed with a metal solvent - cobalt or nickel is used today. Meteorite metals contain about 0. 5 percent cobalt, which sells for about $ 15 a pound. The metals probably include chromium, manganese, cobalt, vanadium, nickel, tungsten and tantalum. The range of the artist's palette widened to include cobalt blue, ultramarine, chrome yellow and viridian green. The result was a glorious panoply of sensual colour ranging from vibrant cobalt to cool mauve-blue, from sunflower yellow to melon. The Royal Shrewsbury Hospital's cobalt unit opened only last September after a massive public fund-raising drive. Uranium shutters, that shield the cobalt radioactive source until the patient is in position, were found to be crumbling. word sets WORD SETS► Elements aluminium, nounargon, nounarsenic, nounbarium, nounbase metal, nounbismuth, nouncadmium, nouncaesium, nouncalcium, nouncarbon, nounchlorine, nounchromium, nouncobalt, nouncopper, nounferrous, adjectivegold, noungold, adjectivegolden, adjectivehalogen, nounhydro-, prefixhydrogen, nouniodine, nouniridium, nouniron, nounisotope, nounkrypton, nounlead, nounlithium, nounmagnesium, nounmanganese, nounmercury, nounmolybdenum, nounnickel, nounnitrogen, nounoxygen, nounphosphorus, nounplatinum, nounplutonium, nounpotassium, nounprecious metal, nounradium, nounradon, nounselenium, nounsilicon, nounsilver, nounsilver, adjectivesodium, nounstrontium, nountin, nountin, adjectivetitanium, nountrace element, nountungsten, nounuranium, nounxenon, nounzinc, noun 1a shiny silver-white metal that is often combined with other metals or used to give a blue colour to substances such as glass. It is a chemical element: symbol Co2 (also cobalt blue) a bright blue-green colour—cobalt adjective
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