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theta 音标拼音: [θ'etə] n. 希蜡字母的第八字 希蜡字母的第八字 theta n 1: the 8th letter of the Greek alphabet 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. [1913 Webster] {Theta function} (Math.), one of a group of functions used in developing the properties of elliptic functions. [1913 Webster]
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