subacid noun 2adjective 1forms 3 noun2 •A mild acidic taste. •Any substance that is moderately acid. adjective1 •Somewhat acidic.Beer may be considered as the wine of grain, for it is the product of the fermentation of malt, just as wine is that of the fermentation of the grape, or other subacid fruits. — 1821 formssubacids · more subacid · most subacid