单词	radius
释义	radius noun ra·​di·​us ˈrā-dē-əs  plural radii ˈrā-dē-ˌī  also radiuses 1 : a line segment extending from the center of a circle or sphere to the circumference or bounding surface 2 a : the bone on the thumb side of the human forearm also : a corresponding part of vertebrates above fishes b : the third and usually largest vein of an insect's wing 3 a : the length of a radius a truck with a short turning radius b : the circular area defined by a stated radius c : a bounded or circumscribed area 4 : a radial part 5 : the distance from a center line or point to an axis of rotation Example Sentences Measure the radius of the circle. a radius of 10 inches The new museum is expected to draw people from a wide radius. There are three restaurants within a one-block radius of our apartment. Recent Examples on the Web Oswego will restrict on-street parking during school days in specific neighborhoods and business districts within a one-mile radius of Oswego East High School to try and solve what officials say is an ongoing student parking issue. Linda Girardi, Chicago Tribune, 29 Aug. 2022 Residents and businesses within a one-mile radius of Thursday’s standoff scene were told to lock doors and stay vigilant, according to the Clinton County Emergency Management Agency. Meryl Kornfield, Spencer S. Hsu And James Bikales, Anchorage Daily News, 12 Aug. 2022 Within a one-mile radius of the standoff scene, residents and businesses were told to lock their doors and stay vigilant, and several highways were partially or completely closed to traffic. James Bikales, Washington Post, 11 Aug. 2022 Clinton County Emergency Management Agency sent out an alert announcing a lockdown in effect for all buildings within a one-mile radius of the intersection at Smith Road and Center Road. Danielle Wallace, Fox News, 11 Aug. 2022 There's a lockdown in effect within a one-mile radius of the standoff scene. Aaron Katersky, ABC News, 11 Aug. 2022 If a glacier was at the equator, this r value would be the radius of the Earth plus the height of the mountain. WIRED, 4 Sep. 2022 Here x could be any number from 0 to 1, and 1 is the radius of the circle. Steven Strogatz, Quanta Magazine, 31 Aug. 2022 The body looks similar, but every single surface has more volume to the radius and corner, and that animates it a little bit more. Elana Scherr, Car and Driver, 27 Aug. 2022 See More Word History Etymology Latin, ray, radius First Known Use 1578, in the meaning defined at sense 1 Phrases Containing radius radius vector radius of curvature radius vector radius of curvature Kids Definition radius noun ra·​di·​us ˈrā-dē-əs  plural radii -dē-ˌī 1 : a straight line extending from the center of a circle to the outside edge or from the center of a sphere to the surface 2 : an area that extends in all directions from a place Most students live within a radius of five miles from the school. 3 : the bone on the thumb side of the arm between the wrist and the elbow Medical Definition radius noun ra·​di·​us ˈrād-ē-əs  plural radii -ē-ˌī  also radiuses : the bone on the thumb side of the human forearm or on the corresponding part of the forelimb of vertebrates above fishes that in humans is movably articulated with the ulna at both ends so as to permit partial rotation about that bone, that bears on its inner aspect somewhat distal to the head a prominence for the insertion of the biceps tendon, and that has the lower end broadened for articulation with the proximal bones of the carpus so that rotation of the radius involves also that of the hand radius noun as in diameter Synonyms & Similar Words Relevance diameter perimeter equator periphery circumference waistline girth compass ambit circuit
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