moon-stone

moon·stone

[moon-stohn]
noun
1.
Also called precious moonstone. a semitransparent or translucent, opalescent, pearly-blue variety of adularia, used as a gem.
2.
any of several adularescent feldspars, as certain varieties of albite, labradorite, or oligoclase, used as gems.
3.
(not used technically) any milky or girasol stone used as a gem.

Origin:
1625–35; moon + stone

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
moonstone (ˈmuːnˌstəʊn) [Click for IPA pronunciation guide]
 
n
a gem variety of orthoclase or albite that is white and translucent with bluish reflections

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Moon-stone is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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