The word radius has different meanings depending on what you are interested in. For instance, it can refer to the straight line from the centre of a circle or sphere to its circumference. It can also mean the corresponding bone in the foreleg of a vertebrate or a bird's wing.

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what is the definition of radius

ra·di·us

[rey-dee-uhs]

NOUN
[PLURAL RA·DI·I, RA·DI·US·ES.]

1.

a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter.

2.

the length of such a line.

3.

any radial or radiating part.

4.

a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles.

5.

a field or range of operation or influence.

Source:
Dictionary.com

A line that joins the center of a circle or sphere with any point on the circumference. Also, radius is one half of the diameter of a circle.

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