tau

(to̵u, tô)

noun

the nineteenth letter of the Greek alphabet (Τ, τ)

Origin: ME taw, tau (esp. with ref. to the tau cross) < L tau < Gr < Sem, as in Heb tav, tav

See tau in American Heritage Dictionary 4

noun
  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.

Origin:

Origin: Greek

Origin: , of Phoenician origin; see tww in Semitic roots

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