rare-earth element

R r

Definitions of rare-earth element words

noun rare-earth element any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. 1
noun rare-earth element any element of the lanthanide series 0
noun rare-earth element any of the series of metallic chemical elements, with consecutive atomic numbers of 57 (lanthanum) through 71 (lutetium) inclusive 0

before 1955

One of the 4% newest English words

First recorded in 1955-60

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adjective

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preposition

conjunction

determiner

exclamation

This term is known only to a narrow circle of people with rare knowledge. Only 2% of English native speakers know the meaning of this word.

According to our data most of word are more popular. This word is almost not used. It has a much more popular synonym.

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