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

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

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

  • adjective (Chem.) 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.

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

  • adjective obsolete, chemistry tetrabasic


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