Definition of Acidify

Babylon English Dictionary
make or become acid; change into acid; make sour
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Acidify Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(v. t.)
To sour; to imbitter.
  
(v. t.)
To make acid; to convert into an acid; as, to acidify sugar.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

acidify
acidifier \a*cid"i*fi`er\ (&?;), n. (chem.) a simple or compound principle, whose presence is necessary to produce acidity, as oxygen, chlorine, bromine, iodine, etc.

for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
To change into acid.
WordNet 2.0

Verb
1. make sour or more sour
(synonym) sour, acidulate, acetify
(hypernym) change taste
(derivation) acid
2. turn acidic; "the solution acetified"
(synonym) acetify
(antonym) alkalize, alkalise, alkalify, basify
(hypernym) change state, turn
(derivation) acidification
(classification) chemistry, chemical science