[Gr. ἀντίχθων, prop. adj. (sc. γῆ earth), f. ἀντί opposite to + χθών the earth, ground.] A (hypothetical) second Earth on the opposite side of the sun.
1655–60. Stanley, Hist. Philos. (1701), 391/2. The tenth is Antichthon, an Earth above, or opposite to ours.
1693. Phil. Trans., XVII. 805. Placing … the Moon as an Antichthone or opposite Earth enlightned by the Sun.
1753. Chambers, Cycl. Supp., s.v., Pythagoras and his disciples asserted an Antichthon.
1865. Grote, Plato, I. i. 13. An hypothetical body, called the Antichthon or Counter-Earth.
