tau

tau  (tou, tô)

n.

1. The 19th letter of the Greek alphabet. See Table at alphabet.

2. An elementary particle of the lepton family, having a mass about 3,550 times that of the electron, a negative electric charge, and a mean lifetime of 3 × 10^-13 seconds. See Table at subatomic particle.

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[Greek, of Phoenician origin; see tww in Semitic roots.]

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tau [tɔː taʊ]

n

(Linguistics / Letters of the Alphabet (Foreign)) the 19th letter in the Greek alphabet (Τ or τ), a consonant, transliterated as t

[via Latin from Greek, of Semitic origin; see tav]

Thesaurus

Noun

1.

tau - the 19th letter of the Greek alphabet Greek alphabet - the alphabet used by ancient Greeks alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"