northerly (adj., adv.)youdaoicibaDictYouDict[northerly 词源字典]
1550s, from northern + -ly (2) on pattern of easterly, westerly.[northerly etymology, northerly origin, 英语词源]
northern (adj.)youdaoicibaDictYouDict
Old English norþerna, norðerne "northern, Northumbrian, Scandinavian," cognate with Old High German nordroni, Old Norse norroenn (see north). With -erne, suffix denoting direction. Related: Northernmost. Northerner in U.S. geo-political sense is attested from 1831. Northern lights "aurora borealis" first recorded by that name 1721 (earlier north-light, 1706).