1. an oxide of a rare-earth element: »

Rare earths can be used in control rods for nuclear reactors, and also as a radiation shielding ingredient in concrete (Science News Letter).

2. = rare-earth element. (Cf.rare-earth element)
rare-earth «RAI URTH», adjective.
of or having to do with rare earth.

Useful english dictionary. 2012.

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