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
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)