rock crystal

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noun

transparent quartz, especially when colorless.

Origin of rock crystal

First recorded in 1660–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for rock crystal

rock crystal


noun

a pure transparent colourless quartz, used in electronic and optical equipment. Formula: SiO 2
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