BLUE JOHN meaning: Semi-precious mineral, primarily fluorite

We found 17 dictionaries that define the word blue john:

General (14 matching dictionaries)

blue john: Merriam-Webster
Blue John: Oxford Learner's Dictionaries
blue john: Collins English Dictionary
blue-john: Wordnik
blue John: Wiktionary
Blue-john: Dictionary.com
Blue John (album), Blue John (mineral), Blue John: Wikipedia, the Free Encyclopedia
Blue-john: Online Plain Text English Dictionary
blue-john: Webster's Revised Unabridged, 1913 Edition
Blue-john: AllWords.com Multi-Lingual Dictionary
blue-john: Webster's 1828 Dictionary
Blue John: Dictionary of Phrase and Fable (1898)
blue-john: FreeDictionary.org
Blue-john, blue john: TheFreeDictionary.com

Computing (1 matching dictionary)

Blue John: Encyclopedia

Medicine (1 matching dictionary)

Blue John: Medical dictionary

Slang (1 matching dictionary)

blue john: Urban Dictionary

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Definitions from Wiktionary (blue John)

▸ noun:  (obsolete, brewing) Afterwort, partially fermented wort.
▸ noun:  A semiprecious mineral mined in Derbyshire, a form of fluorite with bands of a purple-blue or yellowish colour.
▸ noun:  (US regional) Skimmed milk.

Similar:

beeregar, blewe, brewess, blaauwbok, Blew, browis, purl, bibbery, bloude, limbeck, more...

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