circumference
n.
late 14c., from Latin circumferentia, neuter plural of circumferens, present participle of circumferre "to lead around, take around, carry around," from circum "around" (see circum-) + ferre "to carry" (see infer). A loan-translation of Greek periphereia "periphery, the line round a circular body," literally "a carrying round" (see periphery). Related: Circumferential.
〔李〕[circum-=around 环；fer=to bear 承担；-ence n.=thing 物⇒“a line that bears or goes around 一条环行的线”→] n. the boundary line of acircle圆周线，圆周