1. 
   rare earth
   [n] - any element of the lanthanide series (atomic numbers 57 through 71)
   Found op http://www.webdictionary.co.uk/definition.php?query=rare%20earth
   
   
2. 
   rare earth
   An oxide of a rare earth element.
   Found op http://antoine.frostburg.edu/chem/senese/101/glossary/r.shtml
   
   
3. 
   rare earth
   rare-earth element noun any element of the lanthanide series (atomic numbers 57 through 71)
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=rare%20earth
   
   
4. 
   Rare Earth
   [band] Rare Earth is an American rock band affiliated with Motown`s Rare Earth record label (which was named after the band), who prospered in 1970–1972. Although not the first white band signed to Motown, Rare Earth was the first big hit-making act signed by Motown that consisted only of ...
   Found op http://en.wikipedia.org/wiki/Rare_Earth_(band)
   
   
5. 
   rareearth
   1) Kind of element 2) Metallic element 3) Oxide of cerium, yttrium, etc. 4) Terbium or thulium
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/rareearth/1
   
   

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