Antichthon \An*tich"thon\, n.; pl. {Antichthones}. [Gr. ?; 'anti` against + ? the earth.] 1. A hypothetical earth counter to ours, or on the opposite side of the sun. --Grote. [1913 Webster] 2. pl. Inhabitants of opposite hemispheres. --Whewell. [1913 Webster]