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