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radius
[ rey-dee-uhs ]
noun
- 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.
- the length of such a line.
- any radial or radiating part.
- 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.
- a field or range of operation or influence.
- extent of possible operation, travel, etc., as under a single supply of fuel:
the flying radius of an airplane.
- Anatomy. the bone of the forearm on the thumb side. Compare ulna ( def 1 ).
- Zoology. a corresponding bone in the forelimb of other vertebrates.
- Machinery Now Rare. the throw of an eccentric wheel or cam.
- a rounded corner or edge on a machined or cast piece of metal.
- Entomology. one of the principal longitudinal veins in the anterior portion of the wing of an insect.
radius
/ ˈreɪdɪəs /
noun
- a straight line joining the centre of a circle or sphere to any point on the circumference or surface
- the length of this line, usually denoted by the symbol r
- the distance from the centre of a regular polygon to a vertex ( long radius ) or the perpendicular distance to a side ( short radius )
- anatomy the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist
- a corresponding bone in other vertebrates
- any of the veins of an insect's wing
- a group of ray florets, occurring in such plants as the daisy
- any radial or radiating part, such as a spoke
- ( as modifier )
a radius arm
- the lateral displacement of a cam or eccentric wheel
- a circular area of a size indicated by the length of its radius
the police stopped every lorry within a radius of four miles
- the operational limit of a ship, aircraft, etc
radius
/ rā′dē-əs /
, Plural radii rā′dē-ī′
- 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.
- The shorter and thicker of the two bones of the forearm or the lower portion of the foreleg.
- See more at skeleton
Word History and Origins
Word History and Origins
Origin of radius1
Example Sentences
The Copenhagen-inspired project is being designed to allow people to access essential services - workplaces, schools, shops, public transport and healthcare - within a 15-minute radius of their home.
But parking restrictions will not be enforced in areas near the Hurst and Palisades fires or on streets within a one-block radius of evacuation centers.
The idea is that you are CEO of everything within a radius of three metres.
To the city governments’ credit, the number of casualties to date have been limited given the radius of the fires and the amount of damage inflicted.
We had matched because he happened to be in the city, and my five-mile radius setting allowed him to appear.
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