Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. (of an acid) containing five replaceable hydrogen atoms
  • adj. (of a salt) having five atoms of a univalent metal

from the GNU version of the Collaborative International Dictionary of English

  • adj. Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; -- said of certain acids.

from The Century Dictionary and Cyclopedia

  • Noting an acid containing five atoms of hydrogen readily replaceable by metals or electropositive radicals.

Etymologies

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