[ they-tuh, thee- ]
/ ˈθeɪ tə, ˈθi- /


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

Origin of theta

1595–1605; < Greek thêta < Semitic See teth Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for theta

British Dictionary definitions for theta


/ (ˈθiːtə) /


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

Medicine definitions for theta


[ thātə, thē- ]


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.