radius

Meanings

Plural: radii, radiuses

Noun

• the length of a line segment between the center and circumference of a circle or sphere
• a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
• a circular region whose area is indicated by the length of its radius
  • "they located it within a radius of 2 miles"
• the outer and slightly shorter of the two bones of the human forearm
• support consisting of a radial member of a wheel joining the hub to the rim
• The long bone in the forearm, on the side of the thumb.
• The lighter bone (or fused portion of bone) in the forelimb of an animal.
• One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
• A line segment between any point of a circle or sphere and its center.
• The length of this line segment.
• Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.
• The minimum eccentricity of any vertex, for a given graph.

Verb

• To give a rounded edge to.

Synonyms

r, R, spoke, wheel spoke

Related Words

radiad, radial, radiate, radiation, semidiameter, ulna