sour mash sour·mash uncommon noun 1. a mash with optimum acidity for yeast fermentation; a mixture of old and new mash; used in distilling some whiskeys Synonymssour mash 2. any whiskey distilled from sour mash Synonymssour mashsour mash whiskey Related words Word family sour mash whiskey Broader terms whiskeymash WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
