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Any of a series of chemically similar metallic elements with atomic numbers ranging from 57 (lanthanum) through 71 (lutetium). The lanthanides, together with yttrium and scandium, constitute the rare-earth elements. Also called lanthanoid.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) any element of the lanthanide series. Also called: rare earth or rare-earth element
[C19: from lanthanum + -ide]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
lan•tha•nide(ˈlæn θəˌnaɪd, -nɪd)
any element of a series of rare-earth elements of atomic numbers 57 through 71.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Any of a series of 15 naturally occurring metallic elements. The lanthanides include elements having atomic numbers 57 through 71. They are grouped apart from the rest of the elements in the Periodic Table because they all behave in a similar way in chemical reactions. Also called rare-earth element. See Periodic Table.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||lanthanide - any element of the lanthanide series (atomic numbers 57 through 71)|
terbium metal - a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
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