tau Hear it!

tau definition

tau (to̵u, tô)

noun

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

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

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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