tau

tau

[tou, taw for 1, 2, 4; tahv, tawv 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] . 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:
1250–1300; Middle English < Latin < Greek taû < Semitic; cf. tav

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
tau (tɔː, taʊ)
 
n
the 19th letter in the Greek alphabet (Τ, τ), a consonant, transliterated as t
 
[C13: via Latin from Greek, of Semitic origin; see tav]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

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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American Heritage
Abbreviations & Acronyms
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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Encyclopedia Britannica
Encyclopedia

tau

elementary subatomic particle similar to the electron but approximately 3,500 times heavier. Like the electron and the muon, the tau is an electrically charged member of the lepton family of subatomic particles; the tau is negatively charged, while its antiparticle is positively charged

Learn more about tau with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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