radius
/ˈɹeɪ.di.əs/ noun, verb
Forms radii radiuses radiusing radiused
- noun (anatomy) The long bone in the forearm, on the side of the thumb.
- noun (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
- noun (entomology) 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.
- noun (geometry) A line segment between any point of a circle or sphere and its center. “Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment.”
- noun (geometry) The length of this line segment.
- noun 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.
- noun (graph theory) The minimum eccentricity of any vertex, for a given graph.
- verb (transitive) To give a rounded edge to.
Synonyms
Etymology
Borrowed from Latin radius (“ray”). Doublet of ray.
Webster’s 1913
- noun A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
- noun 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.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “radius”, CC BY-SA 4.0. Details