Webster's Revised Unabridged Dictionary · 1913

Septentrion

Septentrion , noun

[Latin septentrio the northern regions, the north, from 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: compare French septentrion.]

The north or northern regions. — Shakespeare
Both East West, South and Septentrioun. — Chaucer

Septentrion , adjective

[Latin septentrionalis: compare French septentrional.]

Of or pertaining to the north; northern.
From cold septentrion blasts. — Milton

Also: Septentrional