Radius meaning

rādē-əs
Radius is a line from the center to the outside of a circle or sphere.

An example of radius is the spoke a bike wheel.

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A circular area measured by a given radius.

Every family within a radius of 25 miles of the city center.

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A radial part or structure, such as a mechanically pivoted arm or the spoke of a wheel.
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A raylike or radial part, as a spoke of a wheel.
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An extent, scope, range, etc. of a limited or specified kind.

Within the radius of one's experience.

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The shorter and thicker of the two bones of the forearm or the lower portion of the foreleg.
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(Remote Authentication Dial-In User Service) An authentication, authorization and accounting (AAA) protocol developed by Livingston Enterprises (later acquired by Lucent). RADIUS uses a challenge/response method for authentication and has been widely used prior to Diameter. See Diameter, network access server and challenge/response.
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A straight line extending from the center of a circle to its edge, or from the center of a sphere to its surface. See also bend radius and radian.
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(anatomy) The long bone in the forearm, on the side of the thumb.
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(zoology) The lighter bone (fused portion of bone) in the forelimb of an animal.
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(geometry) A line segment between any point on the circumference of a circle and its center/centre.
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(geometry) The length of this line segment.
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The definition of a radius is a circular limit or a boundary of a specific distance which is drawn from a specific point.

An example of radius is a restaurant located within five miles of a house.

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A bounded range of effective activity or influence.

The operating radius of a helicopter.

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A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located on the lateral side of the ulna.
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A line segment that joins the center of a circle or sphere with any point on the circumference of the circle or the surface of the sphere. It is half the length of the diameter.
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An Internet protocol used for authentication, authorization, and accounting of end users seeking to gain access to internal computer resources, generally through a network access server (NAS) or, for remote users, by dialing into a remote access server (RAS). Originally developed by Livingston Enterprises, RADIUS was later described by the IETF in RFCs 2058 and 2059 and is currently described in RFCs 2865 and 2866. See also authentication, authorization, IETF, NAS, RAS, and RFC.
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Origin of radius

  • Latin ray, spoke of a wheel, radius

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin radius (“ray")

    From Wiktionary