%hyperborean%

a. [ L. hyperboreus, Gr. &unr_;; "ype`r over, beyond + &unr_;. See Boreas.] 1. (Greek Myth.) Of or pertaining to the region beyond the North wind, or to its inhabitants. [1913 Webster]

2. Northern; belonging to, or inhabiting, a region in very far north; most northern; hence, very cold; fright, as, a hyperborean coast or atmosphere. [1913 Webster]

The hyperborean or frozen sea. C. Butler (1633). [1913 Webster]