an ion with both a positive and a negative charge.
(chem) an ion that carries both a positive and a negative charge

zwitterion zwit·ter·i·on (zwĭt’ər-ī’ən, swĭt’-, tsvĭt’-)
See dipolar ion.
zwit’ter·i·on’ic (-ī-ŏn’ĭk) adj.


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