Pronunciation key

( asid )



[L. acidus, sour < base ac-, sharp].

  1. Sour; sharp and biting to taste; tart.
  2. Substance that dissociates, releasing hydrogen (H-) ions but not hydroxyl (OH+) ions, having a pH of less than 7. see base.
  3. In chemistry, a compound that can react with a base to form a salt, the hydrogen of the acid being replaced by a positive ion; according to modern theory, a compound yielding hydrogen ions (protons) to a base in a chemical reaction: in water solution, an acid tastes sour, turns blue litmus red, and, according to the dissocation theory it produces free hydrogen ions.



  • Biology of Plants, Fourth Edition, Worth Publishers Inc., Stanford University, Peter H. Raven and Helena Curtis, ©1971
  • Webster's New World Dictionary of the American Language (College Edition) ©1955
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