Selenite Definition
 sĕlə-nīt, sĭ-lē- 
    noun
  
 A kind of gypsum found in transparent crystals.
 Webster's New World 
A salt of selenous acid containing the divalent, negative radical SeO3
 Webster's New World 
Other Word Forms of Selenite
Noun
Singular:
 selenitePlural:
 selenitesOrigin of Selenite
-  Latin selēnītēs from Greek selēnītēs (lithos) moon (stone), selenite (so called because it was believed to wax and wane with the moon) from selēnē moon selenium From American Heritage Dictionary of the English Language, 5th Edition 
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