radius (redirected from Radius (geometry))

radius, in anatomy: see arm.

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RADIUS

(Remote Authentication Dial-In User Service) The de facto standard protocol for authentication servers (AAA servers). Developed by Livingston Enterprises (later acquired by Lucent), RADIUS uses a challenge/response method for authentication. See authentication server and challenge/response.

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radius

1. a straight line joining the centre of a circle or sphere to any point on the circumference or surface

2. the length of this line, usually denoted by the symbol r

3. the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius)

4. Anatomy the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist

5. a corresponding bone in other vertebrates

6. any of the veins of an insect's wing

7. a group of ray florets, occurring in such plants as the daisy

8. the lateral displacement of a cam or eccentric wheel

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radius [′rād·ē·əs]

(anatomy)

The outer of the two bones of the human forearm or of the corresponding part in vertebrates other than fish.

(mathematics)

A line segment joining the center and a point of a circle or sphere.

The length of such a line segment.

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RADIUS - Remote Authentication Dial-In User Service