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.