Slightly sour in taste or character; having a mild acid quality with a hint of sharpness.
From Latin 'acidulus,' diminutive of 'acidus' (sour). This classical Latin root gave English the precise vocabulary to distinguish between sharply sour and pleasantly tart.
Acidulous is the perfect word for that subtle tartness of a crisp apple or white wine—sharp enough to be interesting but smooth enough to enjoy repeatedly without wincing!
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