Webster's English Dictionary

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concentric

con.cen.tric \k*n-'sen-trik, (')ka:n-\ \-trik(*-)le-\ 
   \.ka:n-.sen-'tris-*t-e-\ aj [ML concentricus, fr. L com- + centrum center] 
   1: having a common center {~ circles}  2: having a common axis : COAXIAL  - 
   con.cen.tri.cal.ly av