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A variety of chrysoberyl having a shimmering luster and microscopic, needlelike inclusions that reflect a streak of light.
[French : Greek kūma, wave, cyma; see cyma + Greek -phanēs, appearing; see -phane.]
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.
(Minerals) a yellow or green opalescent variety of chrysoberyl
[C19: from Greek kuma wave, undulation + -phane]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
chrys•o•ber•yl(ˈkrɪs əˌbɛr əl)
a green or yellow crystalline mineral, beryllium aluminate, BeAl2O4, sometimes used as a gem.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.