Dictionary

rare earth

noun

Definition of RARE EARTH

1
:  any of a group of similar oxides of metals or a mixture of such oxides occurring together in widely distributed but relatively scarce minerals
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First Known Use of RARE EARTH

1875
Medical Dictionary

rare earth

noun \ˌrer-ˈərth\

Medical Definition of RARE EARTH

1
:  any of a group of similar oxides of metals or a mixture of such oxides occurring together in widely distributed but relatively scarce minerals

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