con·cen·tric (kən-sĕntrĭk) also con·cen·tri·cal (-trĭ-kəl)
Having a common center.
[Middle English concentrik, from Medieval Latin concentricus : Latin com-, com- + Latin centrum, center; see CENTER.]
con′cen·trici·ty (kŏn′sĕn-trĭsĭ-tē) n.
(click for a larger image)concentric
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.