What does radius mean?

Definitions for radius
ˈreɪ di əs; -diˌaɪra·dius

Here are all the possible meanings and translations of the word radius.

Princeton's WordNet

  1. radius, rnoun

    the length of a line segment between the center and circumference of a circle or sphere

  2. radiusnoun

    a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

  3. radiusnoun

    a circular region whose area is indicated by the length of its radius

    "they located it within a radius of 2 miles"

  4. radiusnoun

    the outer and slightly shorter of the two bones of the human forearm

  5. spoke, wheel spoke, radiusnoun

    support consisting of a radial member of a wheel joining the hub to the rim


  1. radiusnoun

    The long bone in the forearm, on the side of the thumb.

    Etymology: From radius

  2. radiusnoun

    The lighter bone (or fused portion of bone) in the forelimb of an animal.

    Etymology: From radius

  3. radiusnoun

    A line segment between any point on the circumference of a circle and its center/centre.

    Etymology: From radius

  4. radiusnoun

    The length of this line segment.

    Etymology: From radius

Webster Dictionary

  1. Radiusnoun

    a right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere

    Etymology: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]

  2. Radiusnoun

    the preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla

    Etymology: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]

  3. Radiusnoun

    a ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2

    Etymology: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]

  4. Radiusnoun

    the barbs of a perfect feather

    Etymology: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]

  5. Radiusnoun

    radiating organs, or color-markings, of the radiates

    Etymology: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]

  6. Radiusnoun

    the movable limb of a sextant or other angular instrument

    Etymology: [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]



    Remote Authentication Dial In User Service is a networking protocol that provides centralized Authentication, Authorization, and Accounting management for computers that connect and use a network service. RADIUS was developed by Livingston Enterprises, Inc. in 1991 as an access server authentication and accounting protocol and later brought into the Internet Engineering Task Force standards. Because of the broad support and the ubiquitous nature of the RADIUS protocol, it is often used by ISPs and enterprises to manage access to the Internet or internal networks, wireless networks, and integrated e-mail services. These networks may incorporate modems, DSL, access points, VPNs, network ports, web servers, etc. RADIUS is a client/server protocol that runs in the application layer, using UDP as transport. The Remote Access Server, the Virtual Private Network server, the Network switch with port-based authentication, and the Network Access Server, are all gateways that control access to the network, and all have a RADIUS client component that communicates with the RADIUS server. The RADIUS server is usually a background process running on a UNIX or Microsoft Windows server. RADIUS serves three functions:

Chambers 20th Century Dictionary

  1. Radius

    rā′di-us, n. (geom.) a straight line from the centre to the circumference of a circle: anything like a radius, as the spoke of a wheel: a ray: (anat.) the exterior bone of the arm: (bot.) the ray of a flower: the movable arm of a sextant: one of the radiating lines of a geometrical spider's web:—pl. Rā′dii (ī).—ns. Rā′dius-bar, -rod, in a steam-engine, a rod pivoted at one end and connected at the other with a concentrically moving part at a fixed distance.—Radius vector (pl. Radii vectores), the distance from a fixed origin to any point of a curve. [L., a rod.]

Dictionary of Nautical Terms

  1. radius

    The semi-diameter of a circle, limb of a sextant, &c.

Military Dictionary and Gazetteer

  1. radius

    In fortification, a term applied to a line drawn from the centre of the polygon to the extremity of the exterior side. There are the exterior, the interior, and the right radii.

Suggested Resources

  1. radius

    Song lyrics by radius -- Explore a large variety of song lyrics performed by radius on the Lyrics.com website.


  1. Radius

    (Comst.); the third of the longitudinal veins starting from base and dividing into not more than five branches before reaching the margin: the branches are numbered 1, 2, 3, 4, and 5, respectively, beginning at the costal margin and extending outward and downward.

How to pronounce radius?

How to say radius in sign language?


  1. Chaldean Numerology

    The numerical value of radius in Chaldean Numerology is: 8

  2. Pythagorean Numerology

    The numerical value of radius in Pythagorean Numerology is: 9

Examples of radius in a Sentence

  1. Trump State Director Chuck Laudner:

    In Spencer, we had 1,500 people, and they came from an hour radius. That's probably more people than vote in the caucus in the area, in Clay County (where Spencer is located), they had 700 people on caucus night. Now what if we only get half of them? We win.

  2. Stefan Gillessen:

    So of course it was fun to watch, but now weve turned it into something useful, we have actually measured the atmosphere around a black hole at a radius, which was completely inaccessible before.

  3. Sean Loudin:

    We are the large regional hospital in a three-hour radius, and we were turning down sick and needy babies from other hospitals.

  4. Hisahiro Sugiura:

    At the time of the bid, it's true that we pledged to keep close 80 percent of the venues within an 8 km radius to lighten the burden on athletes, but as we've looked further into the venues from the aspect of cost and the impact on the lives of people in Tokyo and in Japan, the need to rethink this has emerged.

  5. The Alinker:

    Isolation is a bigger disease or a bigger burden on people than the actual symptoms of the disease itself, so with the Alinker, being engaged in life again because you can go out... your radius expands again.

Images & Illustrations of radius

  1. radiusradiusradiusradiusradius

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    take away to an undisclosed location against their will and usually in order to extract a ransom
    • A. render
    • B. summon
    • C. affront
    • D. abduct

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