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planet (n.)

晚期古英语 planete ,在旧天文学中,"固定星以外的星;在轨道上旋转的星",来自古法语 planete (现代法语 planète ),直接来自晚期拉丁语 planeta ,来自希腊语 planētēs ,来自 (asteres) planētai "徘徊(星)",来自 planasthai "徘徊",这个词的词源不确定。

也许它来自于PIE根 *pele- (2)"平坦;传播"的鼻化形式,在"传播开来"的概念上,"但语义是很有问题的。"据Beekes说,他注意到与希腊文 plazein "使狡猾、驱赶、劝离正道、迷惑"的意义相似,但他补充说,"很难想出形式上的联系"。

之所以这么叫,是因为它们有明显的运动,不像"固定"的星星。原本也包括月亮和太阳,但不包括地球;现代科学意义上的"围绕恒星运行的世界"是16世纪30年代的英语。希腊语是 planesplanetos "四处游荡的人,流浪者"的扩大形式,也是"游荡的星星、星球",在医学上是"不稳定的温度"。

Origin and meaning of planet

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Definitions of planet from WordNet

planet (n.)
(astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction;
Synonyms: major planet
planet (n.)
a person who follows or serves another;
Synonyms: satellite
planet (n.)
any celestial body (other than comets or satellites) that revolves around a star;
From wordnet.princeton.edu