an ion carrying both a positive and a negative charge in different parts of the molecule, as in certain amino acids and protein molecules
Origin of zwitterionGerman ; from zwitter, hybrid (; from Old High German zwitarn ; from zwi-, double, akin to Old English twi-: for Indo-European base see two) + ion, ion
A molecule, especially an amino acid, containing a positively charged ion at one end and a negatively charged ion at the other.
Origin of zwitterionGerman : 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).
From German Zwitter (hermaphrodite) + ion.