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counterearth

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coun⋅ter⋅earth

[koun-ter-urth]
–noun
(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:
1855–60; counter- + earth, as trans. of Gk antíchthōn
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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