Blue-john Definition

noun

(UK, Derbyshire) A semiprecious mineral, a form of fluorite with bands of a purple-blue or yellowish colour.

Wiktionary
(US) Completely skimmed milk, sometimes soured.
Wiktionary

Origin of Blue-john

  • Blue from the slightly blue colour + John of unknown origin.

    From Wiktionary

  • Perhaps from French bleu-jaune, blue-yellow.

    From Wiktionary

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