What is 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) called?

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). (Webster's 1913.)