Basic Guidelines For English Spellings
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1The earth, regarded figuratively as a ship travelling through the heavens, space, etc.
2Science Fiction
A spacecraft belonging to or originating from the planet earth.
3US A type of house designed to have a minimal impact on the environment, characterized by extreme energy efficiency and the use of recycled and natural building materials such as used tyres packed with earth.
Early 19th century; earliest use found in Annual Review and History of Literature. From earth + ship.