Definitions

1. noun

Plural of radius; a line extending from the center of a circle or sphere to the circumference.

“The radii of the Earth are used in calculations for satellite orbits.”

2. noun

A line or distance that is a measure of the distance from the center of a circle or sphere.

“The radii of the wheel determine the turning radius of the vehicle.”

3. noun

In anatomy, the part of a bone that forms a joint.

“The radii of the human body help form the elbow joint.”