RhymeZone: selenite definitions

Definitions of selenite:

noun: (mineralogy) A soft, glassy form of gypsum (chemical formula CaSO₄·2H₂O).
noun: (inorganic chemistry) The anion SeO₃²⁻ derived from selenous acid; any salt or ester of selenous acid.
noun: (science fiction) An inhabitant of Luna, the moon of Terra.
adjective: (science fiction) Pertaining to the inhabitants of Luna (Lunarians/Selenites).

(Definitions from Wiktionary)