theta(redirected from Theta (letter))
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The eighth letter of the Greek alphabet. See Table at alphabet.
[Greek thēta, of Phoenician origin; akin to Hebrew ṭêt, teth.]
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]
the•ta(ˈθeɪ tə, ˈθi-)
n., pl. -tas.
the eighth letter of the Greek alphabet (Θ, θ).
[1595–1605; < Greek thêta < Semitic. See teth]