[lan-thuh-nahyd, -nid]
noun Chemistry.
any element of the lanthanide series.
Also called lanthanon [lan-thuh-non] .

1925–30; lanthan(um) + -ide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lanthanide or lanthanon (ˈlænθəˌnaɪd, ˈlænθəˌnɒn)
rare earth, Also called: rare-earth element any element of the lanthanide series
[C19: from lanthanum + -ide]
lanthanon or lanthanon
[C19: from lanthanum + -ide]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
lanthanide   (lān'thə-nīd')  Pronunciation Key 
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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