definitions

blue john

noun

a blue or purple fibrous variety of fluorspar occurring only in Derbyshire: used for vases, etc

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Nearby words

blue island, blue jasmine, blue jay, blue jeans, blue jet, blue john, blue law, blue laws, blue lias, blue line, blue lips
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