selenite

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sel·e·nite

 (sĕl′ə-nīt′, sĭ-lē′-)
n.
Gypsum in the form of colorless clear crystals.

[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; see selenium.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

selenite

(ˈsɛlɪˌnaɪt)
n
(Minerals) a colourless glassy variety of gypsum
[C17: via Latin from Greek selēnitēs lithos moonstone, from selēnē moon; so called because it was believed to wax and wane with the moon]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

sel•e•nite

(ˈsɛl əˌnaɪt, sɪˈli naɪt)

n.
a variety of gypsum, found in transparent crystals.
[1560–70; < Latin selēnītēs < Greek selēnitēs líthos moonstone; see Selene, -ite1]
sel`e•nit′ic (-ˈnɪt ɪk) sel`e•nit′i•cal, adj.
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