WordReference Random House Unabridged Dictionary of American English © 2026
zwit•ter•i•on  (tsvitər ī′ən),USA pronunciation n. [Physical Chem.]
  1. Chemistryan ion with both a positive and a negative charge.
  • German Zwitterion (1897), equivalent. to Zwitter hybrid, hermaphrodite + Ion ion
zwit•ter•i•on•ic  (tsvit′ər ī onik),USA pronunciation adj. 
'zwitterionic' also found in these entries (note: many are not synonyms or translations):

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