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theta

[they-tuh, thee-] /ˈθeɪ tə, ˈθi-/
noun
1.
the eighth letter of the Greek alphabet (Θ, θ).
2.
the consonant sound represented by this letter.
Origin
1595-1605
1595-1605; < Greek thêta < Semitic See teth
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for θ

theta

/ˈθiːtə/
noun
1.
the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
2.
the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, both Compare edh
Word Origin
C17: from Greek, of Semitic origin; compare Hebrew tēth
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 θ

theta

n.

eighth letter of the Greek alphabet; in ancient Greece, written on ballots to indicate a vote for a sentence of "death" (thanatos), hence occasional allusive use for "death."

Online Etymology Dictionary, © 2010 Douglas Harper
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θ in Medicine

θ
The Greek letter theta. Entries beginning with this character are alphabetized under theta.

theta the·ta (thā'tə, thē'-)
n.

Symbol θ The eighth 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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