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[lan-thuh-nahyd, -nid] /ˈlæn θəˌnaɪd, -nɪd/
noun, Chemistry.
any element of the lanthanide series.
Also called lanthanon
[lan-thuh-non] /ˈlæn θəˌnɒn/ (Show IPA)
Origin of lanthanide
First recorded in 1925-30; lanthan(um) + -ide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for lanthanide


any element of the lanthanide series Also called rare earth, rare-earth element
Word Origin
C19: from lanthanum + -ide
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
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lanthanide in Medicine

lanthanide lan·tha·nide (lān'thə-nīd')
Any of the chemically related elements with atomic numbers 57 through 71. Also called rare earth, rare-earth element.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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lanthanide in Science
Any of a series of 15 naturally occurring metallic elements. The lanthanides include elements having atomic numbers 57 (lanthanum) through 71 (lutetium). 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® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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