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lanthanide

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lan⋅tha⋅nide

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

Origin:
1925–30; lanthan(um) + -ide
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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lan·tha·nide   (lān'thə-nīd')   
n.  See rare-earth element.

[lanthan(um) + -ide.]
rare-earth element   (râr'ûrth')
n.  Any of the abundant metallic elements of atomic number 57 through 71. Also called lanthanide.

[So called because they were originally thought to be rare.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: lan·tha·nide
Pronunciation: 'lan(t)-th&-"nId
Function: noun
: any in a series of elements of increasing atomic numbersbeginning with lanthanum (57) or cerium (58) and ending with lutetium (71)
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

lanthanide lan·tha·nide (lān'thə-nīd')
n.
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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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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