boreal (adj.)

"northern," late 15c., from Late Latin borealis, from Latin Boreas "north wind," from Greek Boreas, name of the god of the north wind, which is of unknown origin, perhaps related to words in Sanskrit (giri-) and Balto-Slavic (Lithuanian girė, Old Church Slavonic gora) for "mountain" (also "forest") as if "those living beyond the mountains."