noun Physical Chemistry.
an ion with both a positive and a negative charge.

< German Zwitterion (1897), equivalent to Zwitter hybrid, hermaphrodite + Ion ion

zwitterionic [tsvit-er-ahy-on-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
zwitterion (ˈtsvɪtərˌaɪən)
chem an ion that carries both a positive and a negative charge
[C20: from German Zwitter hermaphrodite + ion]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

zwitterion zwit·ter·i·on (zwĭt'ər-ī'ən, swĭt'-, tsvĭt'-)
See dipolar ion.

zwit'ter·i·on'ic (-ī-ŏn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
It is thought that a zwitterion is formed between the phenolic hydroxyl and the free amine.
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