ruby spinel

ruby spinel

noun Mineralogy.
a deep red, transparent variety of spinel, used as a gem.
Also called spinel ruby.


Origin:
1830–40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ruby spinel is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
ruby spinel
 
n
a red transparent variety of spinel, used as a gemstone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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