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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

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

Wiktionary

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

GNU Webster's 1913

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

WordNet 3.0

  1. adj. being sour to the taste

Etymologies

  1. From Latin acidulus, diminutive of acidus, sour; see acid.

Examples

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‘acidulous’ has been looked up 1828 times, loved by 1 person, added to 24 lists, and has a Scrabble score of 12.