lan·​tha·​nide ˈlan(t)-thə-ˌnīd How to pronounce lanthanide (audio)
variants or less commonly lanthanoid
: any of the series of elements with increasing atomic numbers that begins with lanthanum or cerium and ends with lutetium see Periodic Table

Examples of lanthanide in a Sentence

Recent Examples on the Web With fantastical names like lanthanides, scandium and yttrium, rare-earth elements play a crucial role in renewable-energy technology, which may be our best hope for avoiding catastrophic global warming. Ron Charles, Washington Post, 7 Mar. 2023 The lanthanide and actinide series — those two rows floating by themselves, named after their first members, lanthanum and actinium — are isolated like that as a concession to limited space. Bill Andrews, Discover Magazine, 26 June 2019 The first possibility is the evolution of a new OPEC-style organization with the power to control vital resources including silicon, copper, lithium, and lanthanides. Andrew Barron, Smithsonian, 20 Feb. 2018

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Word History


International Scientific Vocabulary

First Known Use

1926, in the meaning defined above

Time Traveler
The first known use of lanthanide was in 1926

Dictionary Entries Near lanthanide

Cite this Entry

“Lanthanide.” Dictionary, Merriam-Webster, Accessed 15 Apr. 2024.

Medical Definition


lan·​tha·​nide ˈlan(t)-thə-ˌnīd How to pronounce lanthanide (audio)
: any in a series of elements of increasing atomic numbers beginning with lanthanum (57) or cerium (58) and ending with lutetium (71)
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