Dictionary.com

theta

[ they-tuh, thee- ]
/ ˈθeɪ tə, ˈθi- /

noun

the eighth letter of the Greek alphabet (Θ, θ).
the consonant sound represented by this letter.

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Origin of theta

1595–1605; <Greek thêta<Semitic See teth

Words nearby theta

Sun Also Rises, The, Suppliants, The, Swan Lake, The, The Swiss Family Robinson, The Symposium, theta, tail wagging the dog, the, Tale of Genji, The, talk of the town, the, Taming of the Shrew, The, theta rhythm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for theta

British Dictionary definitions for theta

theta
/ (ˈθiːtə) /

noun

the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, bothCompare edh

Word Origin for theta

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

Medical definitions for theta (1 of 2)

theta
[ thā′tə, thē′- ]

n.

The eighth letter of the Greek alphabet.

Medical definitions for theta (2 of 2)

θ

The Greek letter theta. Entries beginning with this character are alphabetized under theta.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.