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   tau

   /taʊ/

   noun

   • 1. the nineteenth letter of the Greek alphabet (Τ, τ), transliterated as ‘t’.
   • ▪ the nineteenth star in a constellation: "Tau Ceti"
   • ▪ an unstable subatomic particle of the lepton class, with a charge of −1 and a mass roughly 3,500 times that of the electron.

   Word Origin Greek.

   Scrabble Points: 3

   • T

     1

   • A

     1

   • U

     1

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