Dictionary
tau
Pronunciation: (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.