[ 'bɔ:rɪəl ]
■ adjective
1》 chiefly Ecology of the North or northern regions, adjacent to or including the Arctic.
2》 ( Boreal ) Geology relating to or denoting the second climatic stage of the postglacial period in northern Europe (about 9,000 to 7,500 years ago).
Origin
ME: from late L. ~is , from L. Boreas , denoting the god of the north wind, from Gk.