frigid zone

noun

1. either of two regions, one between the Arctic Circle and the North Pole, or one between the Antarctic Circle and the South Pole.

noun

1. archaic the cold region inside the Arctic or Antarctic Circle where the sun’s rays are very oblique

1. Either of two regions of the Earth of extreme latitude, the North Frigid Zone, extending north of the Arctic Circle, or the South Frigid Zone, extending south of the Antarctic Circle.