- a blended grain mash used in the distilling of some whiskeys, consisting of new mash and a portion of mash from a preceding run and yielding a high rate of lactic acid.
Origin of sour mash
An Americanism dating back to 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a grain mash for use in distilling certain whiskeys, consisting of a mixture of new and old mash
- any whiskey distilled from such a mash