from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A rare, dense, silvery-white metallic element with a very high melting point used for electrical contacts and with tungsten for high-temperature thermocouples. Atomic number 75; atomic weight 186.2; melting point 3,180°C; boiling point 5,627°C; specific gravity 21.02; valence 1, 2, 3, 4, 5, 6, 7. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A metallic chemical element (symbol Re) with an atomic number of 75.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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


From Latin Rhēnus, the Rhine.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin Rhenus, Rhine (Wiktionary)


  • Sometimes platinum is combined with a second catalyst (bimetallic catalyst) such as rhenium or another noble metal.


  • High levels of refractory elements such as rhenium can make the alloys prone to the formation of what are known as deleterious topologically close packed

    The Engineer - News

  • By tweaking the mix of other hardening additives like nickel and molybdenum, which are cheaper and more abundant, GE was able to cut the rhenium content in its jet-engine blades to 3% from 6%.

    Testing Their Metals

  • The metals in question range from the truly rare, such as rhenium, to more abundant but hard-to-process elements such as rare-earth metals, a collective name for 17 minerals used in products like iPhones, the Toyota Prius, vacuum cleaners and energy-efficient light bulbs.

    Testing Their Metals

  • The plan builds on the success GE had in paring rhenium from the steel superalloys used in its jet engines and gas turbines.

    Testing Their Metals

  • While those steps reduced the company's rhenium use by two-thirds, GE also started a global recycling partnership with other jet-engine makers to further cut the need for new metal.

    Testing Their Metals

  • GE says its success with rhenium led the company to examine how it could pare usage of other scarce metals.

    Testing Their Metals

  • Seven months later, Rusnano approved 79 million rubles ($2.6 million) in venture funding for Mr. Petrik's project to extract the chemical element rhenium from scrap.

    Russian Inventor Has Friends in Kremlin, but Skeptics Outside It

  • At a hearing on the stockpile last July, a Defense Department official told Congress that the price of rhenium, whose heat-resistant qualities help jet engines operate at higher speeds, at one point shot up 1,000%.

    Pentagon in Race for Raw Materials

  • There are some metals that I might import into the EU once every two or three years (berylllium and rhenium, to give examples).

    Smoking Guns and the Morality of Parliamentary Privilege

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