Etymology
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earth (n.)

古英语 eorþe “地面, 土壤, 泥土, 旱地; 国家, 地区”, 也用于(与 middangeard) “(物质) 世界, 人类的居所” (与天堂或冥界相对), 来自于原日耳曼语 *ertho (也是古弗里斯兰语 erthe “地球”, 古撒克逊语 ertha, 古诺尔斯语 jörð, 中荷兰语 eerde, 荷兰语 aarde, 古高德语 erda, 德语 Erde, 哥特语 airþa), 可能来自于PIE根 *er- (2) “地球, 地面” 的扩展形式.

地球被认为是一个行星, 从15世纪开始被如此称呼. 在旧化学中的使用是1728年. Earth-mover “大型挖掘机” 是从1940年开始的.

Origin and meaning of earth

earth (v.)

“把(尸体) 交到人间”, 14世纪末, 来自 earth (n.). 相关: Earthed; earthing.

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Definitions of earth
1
earth (n.)
the 3rd planet from the sun; the planet we live on;
Synonyms: world / globe
earth (n.)
the loose soft material that makes up a large part of the land surface;
they dug into the earth outside the church
Synonyms: ground
earth (n.)
the solid part of the earth's surface;
the earth shook for several minutes
Synonyms: land / dry land / ground / solid ground / terra firma
earth (n.)
the abode of mortals (as contrasted with Heaven or Hell);
it was hell on earth
earth (n.)
once thought to be one of four elements composing the universe (Empedocles);
earth (n.)
the concerns of this life as distinguished from heaven and the afterlife;
Synonyms: worldly concern / earthly concern / world
earth (n.)
a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage);
Synonyms: ground
2
earth (v.)
hide in the earth like a hunted animal;
earth (v.)
connect to the earth;
earth the circuit
3
Earth (n.)
the 3rd planet from the sun; the planet we live on;
Synonyms: world / globe
Earth (n.)
the abode of mortals (as contrasted with Heaven or Hell);
it was hell on earth
From wordnet.princeton.edu