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; < Greek thêta < Semitic See teth
Examples from the web for theta
  • theta rhythm was evidently essential for hippocampal function, which in turn was essential for memory.
British Dictionary definitions for theta

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
Word Origin and History for 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."

theta in Medicine

theta the·ta (thā'tə, thē'-)
n.

Symbol θ The eighth letter of the Greek alphabet.