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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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