Dictionary![]() ![]() tauPronunciation: (tou, tô for 1, 2, 4; täv, tôv for 3), [key] —n. 1. the 19th letter of the Greek alphabet (T, τ). 2. the consonant sound represented by this letter. 3. tav. 4. Also,tauon. Physics.See tau lepton. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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