Stum

Definition:

(n.) Unfermented grape juice or wine, often used to raise fermentation in dead or vapid wines; must.
(n.) Wine revived by new fermentation, reulting from the admixture of must.
(v. t.) To renew, as wine, by mixing must with it and raising a new fermentation.

Compare stum with other words:

fermentation vs. stum

ferment vs. stum

stum vs. unfermented