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circumcenter

American  
[sur-kuhm-sen-ter] / ˈsɜr kəmˌsɛn tər /

noun

Geometry.
  1. the center of a circumscribed circle; that point where any two perpendicular bisectors of the sides of a polygon inscribed in the circle intersect.


Etymology

Origin of circumcenter

First recorded in 1885–90; circum- + center