WordReference Random House Unabridged Dictionary of American English © 2025
cir•cum•ra•di•us
(sûr′kəm rā′dē əs),USA pronunciation n., pl. -di•i (-dē′ ī′),USA pronunciation -di•us•es. [Geom.]
- Mathematicsthe radius of the circle circumscribed around a triangle.
- circum- + radius