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Noun: sour mash
  1. A mash with optimum acidity for yeast fermentation; a mixture of old and new mash; used in distilling some whiskeys
  2. Any whiskey distilled from sour mash
    - sour mash whiskey

Derived forms: sour mashes

Type of: mash, whiskey [N. Amer, Ireland], whisky

Encyclopedia: Sour mash