Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Slightly sour in taste or in manner. See Synonyms at sour.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Slightly sour; sub-acid; sourish; as an acidulous tincture - Edmund Burke

from the GNU version of the Collaborative International Dictionary of English

  • adj. Slightly sour; sub-acid; sourish.

from The Century Dictionary and Cyclopedia

  • Slightly sour; subacid, as cream of tartar, oranges, gooseberries, etc.
  • Figuratively, sour in feeling or expression; sharp; caustic; harsh.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. being sour to the taste

Etymologies

From Latin acidulus, diminutive of acidus, sour; see acid.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin acidulus ("sourish, acidulous"), diminutive of acidus ("acid, sour"). See acid. (Wiktionary)

Examples

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