southerlyyoudaoicibaDictYouDict[southerly 词源字典]
1550s (adj.); 1570s (adv.); from southern + -ly. Related: Southerliness.[southerly etymology, southerly origin, 英语词源]
southernyoudaoicibaDictYouDict
Old English suðerne, from suð "south" (see south) + -erne, suffix denoting direction. A common Germanic compound (Old Frisian suthern, Old Norse suðroenn, Old High German sundroni). The constellation Southern Cross so called in English by 1756.
southerner (n.)youdaoicibaDictYouDict
1817, American English, from southern. Contrasted with Yankee by 1828.
southernmost (adj.)youdaoicibaDictYouDict
1725, from southern + -most.