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alexandrite

[al-ig-zan-drahyt, -zahn-]
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noun Mineralogy.
  1. a variety of chrysoberyl, green by daylight and red-violet by artificial light, used as a gem.
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Origin of alexandrite

1830–40; named after Alexander I of Russia; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for alexandrite

alexandrite

noun
  1. a green variety of chrysoberyl used as a gemstone
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Word Origin

C19: named after Alexander I (1777–1825), tsar of Russia (1801–25); see -ite 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012