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From WordNet (r) 2.0 [wn]:
rhenium
noun: a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum [syn: {Re}, {atomic number 75}]
From Elements database 20001107 [elements]:
rhenium Symbol: Re Atomic number: 75 Atomic weight: 186.2 Silvery-white metallic transition element. Obtained as a by-product of molybdenum refinement. Rhenium-molybdenum alloys are superconducting.
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