Source : Webster's Revised Unabridged Dictionary (1913)

Perioeci \Per`i*[oe]"ci\, Perioecians \Per`i*[oe]"cians\, n. pl.
   [NL. perioeci, fr. Gr. ?; ? around + ? house, dwelling.]
   Those who live on the same parallel of latitude but on
   opposite meridians, so that it is noon in one place when it
   is midnight in the other. Compare {Ant[oe]ci}.