radius
noun
ra·di·us
| \ ˈrā-dē-əs
\
\
plural radii\ ˈrā-dē-ˌī
\
also radiuses
\
also radiuses
Definition of radius
1
: a line segment extending from the center of a circle or sphere to the circumference or bounding surface
2a
: 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
3a
: 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
Examples of radius in a Sentence
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.
See More
Recent Examples on the Web
Nearly 2,190 licenses that generally cover a 35-mile radius have been granted to 1,300 licensees, according to the FCC. — Felicia Fonseca, The Denver Post, "Tribes across country push for better internet access," 18 Aug. 2019 His size, speed and catch radius are the things offensive coordinators and wide receivers coaches fantasize about for the outside position. — oregonlive.com, "For first time in his career, Juwan Johnson at slot in Oregon skyscrapers receiving package," 15 Aug. 2019 The South Bend clinic would be the only one for a radius of several counties. — Angie Leventis Lourgos, chicagotribune.com, "South Bend at center of abortion debate as unlicensed clinic supported by Mayor Pete Buttigieg is allowed to open via court injunction," 6 Aug. 2019 Considering how last season ended, this day couldn’t come fast enough inside the Crimson Tide locker room and for a healthy radius in every direction. — Michael Casagrande | Mcasagrande@al.com, al, "What you need to know before Alabama opens football practice," 1 Aug. 2019 That's around 60 times radius of the Earth, or enough distance for 30 Earths in between. — David Grossman, Popular Mechanics, "The Moon: An Explainer," 25 July 2019 These rooms typically provide wider doorways, lowered closet rods and enough turning radius for a wheelchair. — New York Times, "How to Plan a Cruise for Travelers With Reduced Mobility," 16 July 2019 The Florida Department of Health in Orange County has issued a 60-day rabies alert for a two mile radius that includes part of Walt Disney World’s Epcot park after a feral cat in the area tested positive for rabies. — Jasmine Aguilera, Time, "Rabies Alert Issued at Disney World's Epcot Due to Feral Cat," 12 July 2019 The flying groceries go to an army of waiting couriers, who deliver online orders free within a 3km radius within 30 minutes. — The Economist, "DistributionAmazon and Alibaba are pacesetters of the next supply-chain revolution," 12 July 2019These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radius.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Keep scrolling for more
Keep scrolling for more
More Definitions for radius
radius
noun
English Language Learners Definition of radius
technical
: a straight line from the center of a circle or sphere to any point on the outer edge
also
: the length of this line
: an area that goes outward in all directions from a particular place
medical
: the bone in the lower part of your arm on the same side as your thumb
See the full definition for radius in the English Language Learners Dictionary
radius
noun
ra·di·us
| \ ˈrā-dē-əs
\
\
plural radii\ -dē-ˌī \
Kids Definition of radius
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
radius
noun
ra·di·us
| \ ˈrād-ē-əs
\
\
plural radii\ -ē-ˌī
\
also radiuses
\
also radiuses
Medical Definition of radius
: 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
Keep scrolling for more