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 (zwĭt′ər-ī′ən, swĭt′-, tsvĭt′-)
A molecule, especially an amino acid, containing a positively charged ion at one end and a negatively charged ion at the other.

[German : Zwitter, hybrid (from Middle High German zwitarn, from Old High German, from zwi-, twice; see dwo- in Indo-European roots) + Ion, ion (from Greek; see ion).]

zwit′ter·i·on′ic (-ī-ŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Chemistry) chem an ion that carries both a positive and a negative charge
[C20: from German Zwitter hermaphrodite + ion]
zwitterionic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈzwɪt ərˌaɪ ən, ˈswɪt-, ˈtsvɪt-)

an ion with both a positive and a negative charge.
[< German Zwitterion (1897) =Zwitter hybrid, hermaphrodite + Ion ion]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Application of zwitterionic detergent to the solubilization of Klebsiella pneumoniae outer membrane proteins for two-dimensional gel electrophoresis.
[33] studied a zwitterionic pentablock copolymer as a template for calcium phosphate synthesis and obtained a mixture of amorphous and crystalline phosphates in which the crystalline component contains several inequivalent ions.
Wu, Light-scattering study of a zwitterionic polycarboxybetaine in aqueous solution, Macromolecules, 33, 3492 (2000).
Zwitterionic is a term for surfactants with a head group consisting of two oppositely charged species.
(12) Loading CQDs with enzyme-responsive mesoporous silica nanocarriers with a pH-switchable zwitterionic surface can be used for targeted imaging and drug delivery to tumors.
In cooperation with scientists at the University of Washington, they have also developed a coating that incorporates zwitterionic, or mixed charge compounds, to manipulate surface environments at the molecular level to prevent proteins from binding to the ship's surface.
According to our previous study for the AuNPs functionalized with zwitterionic lipids of DMPC (Au@DMPC), the LSPR band red-shifted to 580 nm.
Ohno, "Anhydrous proton transport system based on zwitterionic liquid and HTFSI," Chemical Communications, vol.
Kandapallil et al., "Preclinical assessment of a zwitterionic tantalum oxide nanoparticle X-ray contrast agent," ACS Nano, vol.
May, "Binding of DNA to zwitterionic lipid layers mediated by divalent cations," The Journal of Physical Chemistry B, vol.