Of, relating to, or containing malic acid, which is found in unripe fruits and contributes to a sour taste.
From 'malic,' derived from Latin 'malum' (apple). Malic acid was first identified in apples, so the term carries the fruit's Latin name within it.
Malic acid is why sour apples pucker your mouth—the word literally comes from the Latin for apple—and it's the same compound that makes sour candies sour and green grapes tart, all connected through one fruit's chemistry.
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