What does "acidulous" mean?

Slightly sour; subacid; sourish.

What is a synonym for "acidulous"?

Common synonyms include: acidic, acerb, acerbate, acerbic, acerbic, acetic.

Pronounced //əˈsɪdjʊləs//.

/əˈsɪdjʊləs/ adj

adj ·Moderate ·College level

Adjective

1
Slightly sour; subacid; sourish.
"the hard, acidulous, metallic tincture of the spring"
2
Sharp; caustic. figuratively
"He talked with acidulous tolerance of the exalted personages who had sent Ashenden to X."
3
Containing carbonic acid.
"acidulous mineral waters"

Adjective

"the hard, acidulous, metallic tincture of the spring"

Learned borrowing from Latin acidulus (“sourish, acidulous”), diminutive of acidus (“sour, acid”). See acid.