theta

[they-tuh, thee-]
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

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World English Dictionary
theta (ˈθiːtə)
 
n
1.  the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
2.  Compare edh the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, both
 
[C17: from Greek, of Semitic origin; compare Hebrew tēth]

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American Heritage
Medical Dictionary

theta the·ta (thā'tə, thē'-)
n.

Symbol θ 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.
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Example sentences
Theta rhythm was evidently essential for hippocampal function, which in turn was essential for memory.
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