Definition of radius Radius
/ɹejˈdiʌs/ - [reydeeus] - ra•di•us
We found 22 definitions of radius from 9 different sources.
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What does radius mean?
WordNet
NounPlural: radii |
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| radius - the length of a line segment between the center and circumference of a circle or sphere | ||
| r | ||
| length a section of something that is long and narrow; "a length of timber"; "a length of tubing" | ||
| diam, diameter the length of a straight line passing through the center of a circle and connecting two points on the circumference | ||
| semidiameter the apparent radius of a celestial body when viewed as a disc from the earth | ||
| radius - the outer and slightly shorter of the two bones of the human forearm | ||
| arm bone a bone in the arm | ||
| forearm the part of the superior limb between the elbow and the wrist | ||
| radius - a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) | ||
| straight line a line traced by a point traveling in a constant direction; a line of zero curvature; "the shortest distance between two points is a straight line" | ||
| radius - a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles" | ||
| radius - support consisting of a radial member of a wheel joining the hub to the rim | ||
| spoke, wheel spoke | ||
| support a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission; "they called for artillery support" | ||
| bicycle wheel the wheel of a bicycle | ||
| cartwheel acrobatic revolutions with the body turned sideways and the arms and legs outstretched like the spokes of a wheel | ||
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Wiktionary 
- radius (Noun)
The long bone in the forearm, on the side of the thumb. - radius (Noun)
The lighter bone or fused portion of bone in the forelimb of an animal. - radius (Noun)
A line segment between any point on the circumference of a circle and its center/centre. - radius (Noun)
The length of this line segment.
Webster DictionaryWebster's Unabridged Dictionary 📘
- radius (n.)
A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere. - radius (n.)
The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla. - radius (n.)
A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2. - radius (n.)
The barbs of a perfect feather. - radius (n.)
Radiating organs, or color-markings, of the radiates. - radius (n.)
The movable limb of a sextant or other angular instrument.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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radius
A circular region whose area is indicated by the length of its radius. -
radius
Bone of the forearm that extends from the elbow to the thumb side of the wrist.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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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.]
Sailor's Word-BookThe Sailor's Word-Book ⛵
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radius
The semi-diameter of a circle, limb of a sextant, &c.
Military DictionaryMilitary Dictionary and Gazetteer 💥
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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.
Wikipedia 
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In geometry, the radius of a circle or sphere is the shortest connection between the center and the boundary. It is half of the diameter.
The relationship between the radius formula_1 and the circumference formula_2 of a circle is
formula_3
The area formula_4 of a circle of radius
formula_1 is
formula_6
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