Etymology
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acidulous (adj.)

"sub-acidic, slightly sour" (of cream of tartar, oranges, etc.), 1766, also used figuratively for "sour-tempered;" from Latin acidulus "slightly sour," a diminutive of acidus (see acid (adj.)).

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Definitions of acidulous

acidulous (adj.)
being sour to the taste;
Synonyms: acidic / acid / acidulent
From wordnet.princeton.edu