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"boreal" is also used as a crossword clue. If that's what you saw, the answer is often northern (8 letters).
Definitions
comprising or throughout far northern regions
Word origin
Borrowed from Latin boreālis (“northern”), from Boreās, from Ancient Greek Βορέᾱς (Boréās, “personification of the north wind”).
Used in a sentence
“boreal forests”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Far northern”6 letters
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