from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Capable of reacting with four molecules of a monobasic acid. Used of a base.
  • adj. Containing four replaceable hydrogen atoms. Used of an acid or acid salt.
  • n. An acid containing four replaceable hydrogen atoms.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. tetrabasic

from the GNU version of the Collaborative International Dictionary of English

  • adj. Capable of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; -- said of certain bases.


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