Hypertext Webster Gateway: "theta"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Theta \The"ta\, n. [L., fr. Gr. qh^ta, the Greek letter [theta],
[Theta].]
A letter of the Greek alphabet corresponding to th in
English; -- sometimes called the unlucky letter, from being
used by the judges on their ballots in passing condemnation
on a prisoner, it being the first letter of the Greek
qa`natos, death.
{Theta function} (Math.), one of a group of functions used in
developing the properties of elliptic functions.
From WordNet (r) 1.7 (wn)
theta
n : the 8th letter of the Greek alphabet
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