- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for theta
Under the signature of Theta, he has since been a regular contributor of verses to that journal.
A tree in a prairie on a celestial body, as far as Theta of Orion is from Capella, is perfectly visible to us.Lumen
Next to Aldebaran in the V is the interesting double star Theta, which we can see as two distinct stars without a telescope.Astronomy for Young Folks
Isabel Martin Lewis
The Latin language, wanting both the sound of the Greek theta, and the sign to express it (θ) rendered it by th.The English Language
Robert Gordon Latham
The Gothic alphabet, in fact, as used in this country, had a Theta for expressing in one letter our present t and h conjoined.The Book-Hunter
John Hill Burton
- 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
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
Word Origin and History for theta
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
- 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.