Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive & intransitive verb To make or become acid.

from The Century Dictionary.

  • To make acid; convert into an acid; render sour; sour, literally or figuratively.
  • To become acid or sour.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To make acid; to convert into an acid.
  • transitive verb To sour; to imbitter.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb to make something (more) acidic or sour; to convert into an acid.
  • verb to neutralize alkalis, as to acidify sugar
  • verb to sour, to embitter.

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

  • verb turn acidic
  • verb make sour or more sour

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From acid +‎ -fy, from Latin acidus ("sour, acid"); compare French acidifier.

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