circumradius
[ sur-kuh m-rey-dee-uh s ]
/ ˌsɜr kəmˈreɪ di əs /
noun, plural cir·cum·ra·di·i [sur-kuh m-rey-dee-ahy] /ˌsɜr kəmˈreɪˈdiˌaɪ/, cir·cum·ra·di·us·es. Geometry.
the radius of the circle circumscribed around a triangle.