antichthon

From Ancient Greek ἀντίχθων (antíkhthōn), from ἀντί (antí, “against, opposite”) +‎ χθών (khthṓn, “Earth”).

antichthon (plural antichthons)

1. (obsolete) A hypothetical Earth on the opposite side of the Sun.

   Synonym: counter-earth

   • c. 1818 (date written), Samuel Taylor Coleridge, edited by George Whalley, The Collected Works of Samuel Taylor Coleridge: Marginalia II: Camden to Hutton (Bollingen Series; LXXV), London: Routledge & Kegan Paul; Princeton, N.J.: Princeton University Press, published 1984, →ISBN, paragraph 43, page 557:

     It is curious at least, that his Philosophy obliged Pythagoras, to make the Solar System ${\displaystyle =10}$, tho' his imperfect Astrognosy reduced him to the shift of including the moon, and imagining an Antiχθων and taking the whole as a completory Unit—Sun, Mer Ven Earth, Moon, Mars, Jupiter, Saturn, Antichthon ${\displaystyle =9+}$ Solar Syst ${\displaystyle =1=10}$

• Antichthon

• antichthonic

• “antichthon”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.