/ Dictionary / Index V vagotonia: Meaning and Definition of Find definitions for: va•go•to•ni•a Pronunciation: (vā"gu-tō'nē-u), [key] — n. Pathol. hyperexcitability of the vagus nerve, producing bradycardia, decreased heart output, and faintness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vagotomy vagotropic Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language