Usually means: Semi-precious mineral, primarily fluorite.
Definitions Related words Mentions
We found 17 dictionaries that define the word blue john:

General (14 matching dictionaries)
  1. blue john: Merriam-Webster.com
  2. Blue John: Oxford Learner's Dictionaries
  3. blue john: Collins English Dictionary
  4. blue-john: Wordnik
  5. blue John: Wiktionary
  6. Blue-john: Dictionary.com
  7. Blue John (album), Blue John (mineral), Blue John: Wikipedia, the Free Encyclopedia
  8. Blue-john: Online Plain Text English Dictionary
  9. blue-john: Webster's Revised Unabridged, 1913 Edition
  10. Blue-john: AllWords.com Multi-Lingual Dictionary
  11. blue-john: Webster's 1828 Dictionary
  12. Blue John: Dictionary of Phrase and Fable (1898)
  13. blue-john: Free Dictionary
  14. Blue-john, blue john: Dictionary/thesaurus

Computing (1 matching dictionary)
  1. Blue John: Encyclopedia

Medicine (1 matching dictionary)
  1. Blue John: Medical dictionary

Slang (1 matching dictionary)
  1. blue john: Urban Dictionary

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.

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