HyperDic English RAR ... rare earth

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English 1 sense of the expression *rare earth*:
NOUN	substance	rare earth, rare-earth element, lanthanoid, lanthanide, lanthanon	any element of the lanthanide series (atomic numbers 57 through 71)

Englishrare earth: 1 sense noun 1, substance
Meaning	Any element of the lanthanide series (atomic numbers 57 through 71).
Synonyms	rare-earth element, lanthanoid, lanthanide, lanthanon
Narrower	terbium metal	A separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
Broader	group, grouping	Any number of entities (members) considered as a unit
Spanish	lantánido, tierras raras
Catalan	lantànid, terres rares

HyperDicEnglishRAR ... rare earth