[tsvit-er-ahy-uh n]

noun Physical Chemistry.

an ion with both a positive and a negative charge.

Origin of zwitterion

< German Zwitterion (1897), equivalent to Zwitter hybrid, hermaphrodite + Ion ion
Related formszwit·ter·i·on·ic [tsvit-er-ahy-on-ik] /ˌtsvɪt ər aɪˈɒn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for zwitterion



chem an ion that carries both a positive and a negative charge
Derived Formszwitterionic (ˌtsvɪtəraɪˈɒnɪk), adjective

Word Origin for zwitterion

C20: from German Zwitter hermaphrodite + ion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

zwitterion in Medicine


[zwĭtər-ī′ən, swĭt-, tsvĭt-]


dipolar ion
Related formszwit′ter•i•onic (-ī-ŏnĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.