The Collaborative International Dictionary
Mutage
Mutage \Mu"tage\ (m[=u]"t[asl]j), n. [F.] A process for checking the fermentation of the must of grapes.
Wiktionary
mutage
n. A process for checking the fermentation of the must of grapes.
Wikipedia
Mutage
Mutage is a wine making technique for making sweet wines.