What does "hyperborean" mean?

Hyperborean: Northern; belonging to, or inhabiting, a region in very far north; most northern; hence, very cold; fright, as, a hyperborean coast or atmosphere. The hyperborean or frozen sea. C. Butler (1633).

Additional senses

  1. 2.(Greek Myth.) One of the people who lived beyond the North wind, in a land of perpetual sunshine.
  2. 3.An inhabitant of the most northern regions.

Sources