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

  • n. A molecule carrying both a positive and a negative charge.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A molecule, such as an amino acid, that carries both a positive and a negative charge.


German : Zwitter, hybrid (from Middle High German zwitarn, from Old High German, from zwi-, twice) + Ion, ion (from Greek; see ion).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From German Zwitter (hermaphrodite) + ion. (Wiktionary)


  • 'Others have searched for such zwitterion [electrically neutral compound that carries positive and negative charges on different atoms] formation in molecular clusters unsuccessfully, but theoreticians had predicted the possibility that only four water molecules might suffice for the reaction to proceed spontaneously,' adds Zwier.

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  • Control of pH in human long-term bone marrow cultures with low-glucose medium containing zwitterion buffer lengthens the period of haemopoietic activity.

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  • That seems big for such simple cases as binding a dropdownlist so I assume that EF is doing extra unnecessary work somewhere) zwitterion

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  • This word has nothing to do with persons who use the social medium Twitter. Just sayin'.

    February 8, 2010