| rare earth |
any element of the lanthanide series (atomic numbers 57 through 71)
출처: wordnet.princeton.edu/perl/webwn
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| rare-earth element |
rare earth: any element of the lanthanide series (atomic numbers 57 through 71)
출처: wordnet.princeton.edu/perl/webwn
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| rare earth |
A rare earth is an oxide of a rare earth element. Often rare earth elements themselves are loosely called "rare earths".As to exactly what is a "rare earth" element is a matter of some ambiguity. The narrowest definition restricts it to the lanthanides, which are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. ...
출처: en.wikipedia.org/wiki/Rare_earth
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| rare earth e.’s |
elements of the lanthanum series, comprising elements with atomic numbers 57 to 71.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| rarefaction |
the condition of being or becoming less dense; diminution in density and weight, but not in volume.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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