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blue John English

Meaning blue John meaning

What does blue John mean?

blue John

(obsolete, brewing) Afterwort, partially fermented wort. [17th-19th c.] A semiprecious mineral mined in Derbyshire, a form of fluorite with bands of a purple-blue or yellowish colour. [from 18th c.] (US, _, regional) Skimmed milk. [from 19th c.]

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