Rare-earth Definition

noun
Any of certain basic oxides much alike in physical and chemical properties; specif., any of the oxides of the rare-earth elements.
Webster's New World
Any of the rare-earth elements.
Webster's New World

(chemistry) Naturally occurring oxides of the lanthanide metals; they are widely distributed in relatively small concentrations and are used in glassmaking, ceramic glazes etc.

Wiktionary
Synonyms:

Other Word Forms of Rare-earth

Noun

Singular:
rare-earth
Plural:
rare-earths

Origin of Rare-earth

  • rare (because the minerals from which the rare-earth elements were first isolated are uncommon) earth metallic oxide

    From American Heritage Dictionary of the English Language, 5th Edition

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