sour mash
noun
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
Words nearby sour mash
sour cream,
sour dock,
sour gourd,
sour grapes,
sour gum,
sour mash,
sour on,
sour orange,
sour salt,
sour-milk cheese,
sourball
British Dictionary definitions for sour mash
sour mash
noun US
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