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tau

[tou, taw for 1, 2, 4; tahv, tawv for 3] /taʊ, tɔ for 1, 2, 4; tɑv, tɔv for 3/
noun
1.
the 19th letter of the Greek alphabet (T, τ).
2.
the consonant sound represented by this letter.
3.
tav.
4.
Also, tauon [tou-on] /ˈtaʊ ɒn/ (Show IPA). Physics. tau lepton.
5.
Also called tau protein. Biochemistry. a protein that is an important component of nerve cells, helping to maintain their function and structure: in the brain, distortions in the protein’s molecular shape is associated with the onset of Alzheimer’s disease.
Origin of tau
1250-1300
1250-1300; Middle English < Latin < Greek taû < Semitic; cf. tav
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for τ

tau

/tɔː; taʊ/
noun
1.
the 19th letter in the Greek alphabet (Τ, τ), a consonant, transliterated as t
Word Origin
C13: via Latin from Greek, of Semitic origin; see tav
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for τ

tau

nineteenth letter of the Greek alphabet, from Hebrew taw, last letter of the Hebrew alphabet, literally "sign, mark."

Online Etymology Dictionary, © 2010 Douglas Harper
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τ in Medicine

τ
The Greek letter tau. Entries beginning with this character are alphabetized under tau.

tau n.

Symbol τ The 19th letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Related Abbreviations for τ

TAU

Taurus
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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