One of the mysteries of the English language finally explained.
Underground; = "subterranean".
1A dwelling, region, etc., below the surface of the earth. Also (with the): the underworld.
2Originally Science Fiction. A subterranean tunnelling machine; especially one which melts the rock in front of it and causes the molten rock to form a glassy lining to the tunnel as it develops.
Early 17th century; earliest use found in John Healey (c1585–c1616), translator. From classical Latin subterrēnus situated below the level of the earth, beneath the horizon (2nd cent. a.d. in Apuleius) from sub- + terrēnus.
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