Look up demijohn in Wiktionary, the free dictionary.

A demijohn is a container for fluids used in brewing.

Demijohn may also refer to:

• Demijohn Limited, a Scottish business
• Thom Demijohn, a joint pseudonym used by authors Thomas M. Disch and John Sladek for their satirical novel Black Alice
• Demijohn Lake (Ontario), a lake in Thunder Bay District, Ontario, Canada

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