acidity
a-cid-i-ty
noun
An excessive amount of acid, especially in the stomach, causing discomfort.
"He took medicine to relieve his stomach acidity."
noun
The quality or state of being acid, often perceived as sourness.
"The fruit's high acidity made it tart."
Thesaurus
Synonyms: sourness, sour, acidulousness
Antonyms: alkalinity