Radius (noun)

1. A straight line segment from the center of a circle to any point on the circle.
2. The length of such a line segment.
3. The bone in the forearm on the thumb side.

Origin:

The word "radius" is derived from the latin word "radius" meaning "rod" or "spoke". it was used to describe a straight line from the center of a circle to its circumference. in geometry, it is a straight line segment from the center of a circle to any point on the circle.

Examples:

1. The radius of the circle was measured to be 10 cm.
2. The radius is one of the two bones in the forearm.
3. The radius and ulna are the two bones of the forearm.
4. The radius is the bone of the forearm on the thumb side.
5. The radius helps to rotate the hand at the wrist.