'Sourness' definitions:

Definition of 'sourness'

From: WordNet
noun
The taste experience when vinegar or lemon juice is taken into the mouth [syn: sour, sourness, tartness]
noun
The property of being acidic [syn: sourness, sour, acidity]
noun
A sullen moody resentful disposition [syn: sulkiness, sullenness, moroseness, sourness]

Definition of 'Sourness'

From: GCIDE
  • Sourness \Sour"ness\, n. The quality or state of being sour. [1913 Webster]