rare earth element

noun

Definition of rare earth element

: any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of the lanthanide series and sometimes yttrium and scandium

— called also rare earth metal

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Some analysts have asked whether there are similarly irreplaceable assets on the Chinese side – such as rare earth elements exported to the U.S. – to be used as reciprocal leverage. — Ling Chen, Washington Post, "How this trade war could backfire — in China’s favor," 25 June 2018 These rare earth elements come from swirls of dust deposited during the winter storms, so the elements’ prevalence is a reliable gauge of storm intensity. — Elizabeth Svoboda, Scientific American, "Cores from Coral Reefs Hold Secrets of the Seas’ Past and Future," 6 June 2018 Marine scientists at China’s Guangxi Key Laboratory recently deduced the strength of East Asian winter monsoons over the past 150 years by measuring levels of rare earth elements, such as lanthanum and cerium, in each layer of a Poritescoral core. — Elizabeth Svoboda, Scientific American, "Cores from Coral Reefs Hold Secrets of the Seas’ Past and Future," 6 June 2018 Rare earth minerals contain rare earth elements (located here on the periodic table) that are used in high-tech devices like smartphones, missile systems, radar devices and hybrid vehicles. — Aj Willingham, CNN, "How the mud in this small Japanese island could change the global economy," 16 Apr. 2018 Joshua Zide, an associate professor of materials science and engineering at the University of Delaware, studies rare earth elements, particularly terbium, which is part of the chemical element combination for Saini’s discovery. — Kristen A. Schmitt, Smithsonian, "Is This New Material a Game Changer for Thermoelectricity?," 10 Apr. 2017

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rare earth element

noun

Medical Definition of rare earth element

: any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of the lanthanide series and sometimes yttrium and scandium

— called also rare earth metal