periphery (n.)youdaoicibaDictYouDict[periphery 词源字典]
late 14c., "atmosphere around the earth," from Old French periferie (Modern French périphérie), from Medieval Latin periferia, from Late Latin peripheria, from Greek peripheria "circumference, outer surface, line round a circular body," literally "a carrying around," from peripheres "rounded, moving round, revolving," peripherein "carry or move round," from peri- "round about" (see peri-) + pherein "to carry" (see infer). Meaning "outside boundary of a surface" attested in English from 1570s; general sense of "boundary" is from 1660s.[periphery etymology, periphery origin, 英语词源]