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ruby spinel

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noun Mineralogy.
  1. a deep red, transparent variety of spinel, used as a gem.

Origin of ruby spinel

First recorded in 1830–40
Also called spinel ruby.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for ruby spinel

ruby spinel

noun
  1. a red transparent variety of spinel, used as a gemstone
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