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Webster 1913 Edition

Adj.

[L.

acidulus

, dim. of

acidus

. See Acid.]

Slightly sour; sub-acid; sourish;

as, an

acidulous

tincture

E. Burke.

Acidulous mineral waters

such as contain carbonic anhydride.

Adj.

[L. acidulus. See Acid.]

Slightly sour; sub-acid, or having an excess of acid; as acidulous sulphate.

acidulous

Slightly sour; sub-acid; sourish.
- Edmund Burke
  an acidulous tincture
- 1931: He talked with acidulous tolerance of the exalted personages who had sent Ashenden to X. -- W. Somerset Maugham, His Excellency

slightly sour