Definition of Acidulate

Babylon English Dictionary
make slightly acidic; embitter, make sour
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Acidulate Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(v. t.)
To make sour or acid in a moderate degree; to sour somewhat.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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acidulate
acidness \ac"id*ness\ (&?;), n. acidity; sourness.

WordNet 2.0

Verb
1. make sour or more sour
(synonym) sour, acidify, acetify
(hypernym) change taste
(derivation) acid
Acidulate Definition from Society & Culture Dictionaries & Glossaries
Dictionary Of Cooking And Food Terms
To give a dish or liquid a slightly acidic, tart or piquant taste by adding some lemon juice, vinegar, or unripened fruit juice. Also, one can acidulate fresh cream by adding lemon juice to get sour cream.