Webster’s Revised Unabridged Dictionary · 1913
Boreal
Bo′re·al (bō′rē·al), a. [L. borealis: cf. F. boréal. See Boreas.] Northern; pertaining to the north, or to the north wind; as, a boreal bird; a boreal blast.
So from their own clear north in radiant streams, Bright over Europe bursts the boreal morn. Thomson.