concentric
adj.
c.1400, from Middle French concentrique, from Medieval Latin concentricus, from com- "together" (see com-) + centrum "circle, center" (see center, n.).
〔李〕[con-=together 共同；centr=cenrte 中心；-ic a.=having有……的→] a. having a common center同心的/concentric circles同心圆▽concentricity [concentric;-ity n.] n.同心；同心度