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The Collaborative International Dictionary

Acidulous \A*cid"u*lous\, a. [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.

Douglas Harper's Etymology Dictionary

1769, "sub-acidic," used figuratively for "sour-tempered;" from Latin acidulus "slightly sour," a diminutive of acidus (see acid (adj.)).


a. Slightly sour; sub-acid; sourish.


adj. tasting sour like acid [syn: acidic, acidulent]

Usage examples of "acidulous".

It did not matter that Wheeler would not have wished the acidulous Gabbert on anyone as a lover.

The thick leaves contain an abundant acidulous astringent juice, which is mucilaginous, and affords malic acid, identical with that of the Apple.

Even Archondula, that stiff, acidulous old maid, had run into the street with her deaf-and-dumb brother on her arm.

Simon bit into one, and found his mouth suddenly curdled into an acidulous ball.