subacid

adj

1. 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.”

   “An excellent temper, with a slight degree of subacid humour.”

   “Summerlee drew him on with his chorus of subacid criticism, while Lord John and I laughed at the contest and the lady, her hand upon his sleeve, controlled the bellowings of the philosopher.”

noun

1. A mild acidic taste.

   “Rosellas, a fruit, I imagine, not very well known, we grew most successfully, its delicious sub-acid making the most splendid substitute for the English red currant; and we varied its uses by transforming the raw material into jam and jelly, and freshly-stewed fruit.”

2. Any substance that is moderately acid.