- Archaic designation for a condition in which the parasympathetic autonomic system is reputedly overactive. SYN: parasympathotonia, sympathetic imbalance. [vago- + G. tonos, strain]
* * *va·go·to·nia .vā-gə-'tō-nē-ə n excessive excitability of the vagus nerve resulting typically in vasomotor instability, constipation, and sweating compare SYMPATHICOTONIAva·go·ton·ic -'tän-ik adj
* * *va·go·to·nia (va″go-toґne-ə) [vagus + ton- + -ia] hyperexcitation of the vagus nerve, resulting in increased parasympathetic tone. vagotonic adj
Medical dictionary. 2011.