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

  • n. A silvery metallic element, not a rare earth but occurring in nearly all rare-earth minerals, used in various metallurgical applications, notably to increase the strength of magnesium and aluminum alloys. Atomic number 39; atomic weight 88.906; melting point 1,522°C; boiling point 3,338°C; specific gravity 4.45 (25°C); valence 3. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A metallic chemical element (symbol Y) with an atomic number of 39.

from the GNU version of the Collaborative International Dictionary of English

  • n. A rare metallic element of the boron-aluminium group, found in gadolinite and other rare minerals, and extracted as a dark gray powder. Symbol Y. Atomic number 39. Atomic weight, 88.9.

from The Century Dictionary and Cyclopedia

  • n. Chemical symbol, Y; atomic weight, 89 (?). A metal, the base of the earth yttria.

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

  • n. a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys


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

From yttria.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ytterby, (literally, "outer village") a town in Sweden.


  • A material called yttrium barium copper oxide can be turned into a superconductor by exposure to liquid nitrogen - which makes it one of the highest-temperature superconductors.

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  • The development project with mine-owner Wings Enterprises Inc. comes as concerns heighten about China's tight grip on production of metals such as yttrium required in hybrid vehicles, wind turbines, flat panel televisions, defense missiles and satellites.

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  • Solid oxide fuel cells typically require rare elements such as yttrium, zirconium, lanthanum, strontium or cesium, cerium, etc.

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  • Exotic materials such as yttrium silver (a metallic compound that manages to be both ductile and strong at the same time) and lithium niobate (which does all manner of weird things to light) are fascinating regardless of whether they might be some sort of real-world equivalents of mithril or the palantirs.

    The Science of Middle Earth, by Henry Gee. Book review

  • Ninety per cent of rare earth elements, with arcane names such as yttrium, samarium and lanthanum, are mined in China, and are used in high-tech applications such as smartphones and lasers. Top Stories

  • They say that minute amounts of a metal called 'yttrium' may impede neuronal activity. News Feed

  • China controls up to 97% of world production of these elements — which include samarium, scandium and yttrium — and its export quotas for this year are nearly exhausted.

    Rare Earth Shortages Hit Germany

  • I look forward to his discussion of scandium and yttrium. I'll Have Mine Rare

  • Rare earth alloys include rare-earth ferrosilicon—with 17%-37% rare-earth content—which is used as an additive in steel and iron smelting, and magnesium rare earth, which contains 2%-10% of rare-earth elements yttrium and gadolinium and is used in the aviation, automotive and defense sectors.

    China Tightens Rare-Earth Rules

  • In particular, China produces 97% of the world's supply of so-called "rare earth" elements, including neodymium, yttrium, dysprosium and 14 others, which have long been recognized as essential to the development of defense equipment ranging from helicopters to tank guns to missiles.

    Rizwan Ladha: The US Defense Establishment Is Tied Inextricably to China


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  • Y

    December 2, 2007