Definitions

from The Century Dictionary.

  • In chem., capable of combining with an acid in two different proportions: said of a base.

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

  • adjective (Chem.) Having two hydrogen atoms which can be replaced by negative atoms or radicals to form salts; -- said of bases. See diacid.

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

  • adjective chemistry Having two hydrogen atoms that can be replaced by negative atoms or radicals to form salts.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

bi- +‎ acid

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