[ lan-thuh-nahyd, -nid ]
/ ˈlæn θəˌnaɪd, -nɪd /

noun Chemistry.

any element of the lanthanide series.

Origin of lanthanide

First recorded in 1925–30; lanthan(um) + -ide
Also called lan·tha·non [lan-thuh-non] /ˈlæn θəˌnɒn/. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for lanthanide


lanthanon (ˈlænθəˌnɒn)

/ (ˈlænθəˌnaɪd) /


any element of the lanthanide seriesAlso called: rare earth, rare-earth element

Word Origin for lanthanide

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

Medicine definitions for lanthanide


[ lănthə-nīd′ ]


Any of the chemically related elements with atomic numbers 57 through 71.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.

Science definitions for lanthanide


[ lănthə-nīd′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.