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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.