radius
🇺🇸
/ˈreɪdiəs/
🇬🇧
/ˈreɪdiəs/
A straight line from the center of a circle to its edge, or how long that line is.
The radius of the circle is 3 inches.
A round area around a center point, measured by distance from that point.
The restaurant delivers within a 2-mile radius.
The shorter bone in your lower arm, on the thumb side.
He broke the radius in his arm when he fell.