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counterearth

[koun-ter-urth] /ˈkaʊn tərˌɜrθ/
noun
1.
(in Pythagorean astronomy) a planet, out of sight from our part of the earth, whose shadow upon the sun and moon, cast by a central fire that is also out of sight, causes the eclipses.
Also called antichthon.
Origin
1855-1860
1855-60; counter- + earth, as translation of Greek antíchthōn
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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