/ Dictionary / Index V vasotonic: Meaning and Definition of Find definitions for: vas•o•ton•ic Pronunciation: (vas"ō-ton'ik, vā"zō-), [key] — adj. Physiol. pertaining to or regulating the tone of the blood vessels. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vasotomy vasovasostomy Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language