The Collaborative International Dictionary of English v.0.48:

Septentrion \Sep*ten"tri*on\, n. [L. septentrio the northern
   regions, the north, fr. septentriones the seven stars near
   the north pole, called Charles's Wain, or the Great Bear,
   also those called the Little Bear; properly, the seven plow
   oxen; septem seven + trio, orig., a plow ox: cf. F.
   septentrion.]
   The north or northern regions. --Shak.
   [1913 Webster]

         Both East West, South and Septentrioun.  --Chaucer.
   [1913 Webster] Septentrion

The Collaborative International Dictionary of English v.0.48:

Septentrion \Sep*ten"tri*on\, Septentrional \Sep*ten"tri*on*al\,
   a. [L. septentrionalis: cf. F. septentrional.]
   Of or pertaining to the north; northern. "From cold
   septentrion blasts." --Milton.
   [1913 Webster]