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rarely
rareripe
rarified
rarify
raring
rarity
RAS
Ras al-Am
ras malai
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rare-earth element
rare-earth el·e·ment (plural rare-earth el·e·men·ts)


noun 
Definition:
 
lanthanide element: a member of the lanthanide series, which contains 15 elements that have atomic numbers from 57 to 71 and share closely related chemical properties
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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