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lanthanide series

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noun Chemistry.
  1. the series of rare-earth elements of atomic numbers 57 through 71 (lanthanum through lutetium).
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Origin of lanthanide series

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for lanthanide series

lanthanide series

noun
  1. a class of 15 chemically related elements with atomic numbers from 57 (lanthanum) to 71 (lutetium)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012