The Collaborative International Dictionary of English v.0.48:

Antoeci \An*t[oe]"ci\ ([a^]n*t[=e]"s[imac]), Antoecians
\An*t[oe]"cians\(-shanz), n. pl. [NL. antoeci, fr. Gr. pl.
   'a`ntoiki; 'anti` opposite + o'ikei^n to live.]
   Those who live under the same meridian, but on opposite
   parallels of latitude, north and south of the equator.
   [1913 Webster]