/ Dictionary / Index T tau neutrino: Meaning and Definition of Find definitions for: tau' neutri"no Pronunciation: (tô-on'ik, tou-). [key] — Physics. Physics. a hypothetical type of neutrino that would obey a conservation law together with the tau lepton, with the total number of tau leptons and tau neutrinos minus the total number of their antiparticles remaining constant. Also calledCf.. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tau lepton taunt Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language