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 (thā′tə, thē′-)
The eighth letter of the Greek alphabet. See Table at alphabet.

[Greek thēta, of Phoenician origin; akin to Hebrew ṭêt, teth.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Letters of the Alphabet (Foreign)) the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
2. (Letters of the Alphabet (Foreign)) the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, both. Compare edh
[C17: from Greek, of Semitic origin; compare Hebrew tēth]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈθeɪ tə, ˈθi-)

n., pl. -tas.
the eighth letter of the Greek alphabet (Θ, θ).
[1595–1605; < Greek thêta < Semitic. See teth]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.theta - the 8th letter of the Greek alphabettheta - the 8th 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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
Or, a non- significant sound, which out of several sounds, each of them significant, is capable of forming one significant sound,--as {alpha mu theta iota},
He was also invited to join the "Lambs" -- Redmondese for Lamba Theta -- a compliment rarely paid to a Freshman.