rare earth
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rare earth
Where it comes from
From rare + earth. First use appears c. 1841 in the publications of Henry Minchin Noad. See cite below.
noun rare earths
- Any of the naturally occurring oxides of the lanthanide metals; they are widely distributed in relatively small concentrations and are used in glassmaking, ceramic glazes etc. Meronyms: rare earth element, rare earth metal
- A rare earth element. Near-synonym: lanthanide
