radius
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.
Origin of radius
1Words that may be confused with radius
- circumference, diameter, radius , tangent
Words Nearby radius
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use radius in a sentence
At this point, solvers like Thanh Nguyen used trigonometry to calculate the inner radius of the annulus, which turned out to be R√3.
Can You Cut The Square … Into More Squares? | Zach Wissner-Gross | January 8, 2021 | FiveThirtyEightNot only did Grinin’s team find a value for the charge radius of the proton consistent with the value obtained in muonic hydrogen, they inferred a much more precise value for the Rydberg constant.
A Breakthrough in Measuring the Building Blocks of Nature - Facts So Romantic | Subodh Patil | January 8, 2021 | NautilusKnow your radiusEvery smart device implements its geofencing radius a little differently.
Geofencing can level up your smart home if you set it up properly | Whitson Gordon | January 4, 2021 | Popular-ScienceThrough our network of centrally located fulfillment centers we are able to service customers in a small delivery radius.
Gorillas, the on-demand grocery delivery startup taking Berlin by storm, has raised $44M Series A | Steve O'Hear | December 11, 2020 | TechCrunchThere are a couple of ways to measure a proton's charge radius.
Physics is somewhat less broken, but still not quite right | John Timmer | December 2, 2020 | Ars Technica
By “the Internet,” they meant the people within a seven-cubicle radius of the person who wrote that blog post.
The Outrage Over Beyonce’s Bettie Page Bangs: Why the Media Must Stop Objectifying Women | Phoebe Robinson | October 15, 2014 | THE DAILY BEASTSoon even the closest spectators, right at the edge of my empty radius, turned and looked at me.
Another requirement was that the Colombian National Police would not be permitted within a 12-mile radius of his prison.
Pablo Escobar’s Private Prison Is Now Run by Monks for Senior Citizens | Jeff Campagna | June 7, 2014 | THE DAILY BEASTIn 2012, FIS announced a new requirement increasing the minimum turn radius of GS skis by eight meters.
The Can't-Miss Sochi Showdown: Bode Miller And Ted Ligety | Jake Bright | February 9, 2014 | THE DAILY BEASTThese were then spread over a 300-mile radius, covered in ravines, gorges and pine forests.
The Bosnia Atrocities, the World’s Greatest Forensic Puzzle | J.P. O’Malley | December 1, 2013 | THE DAILY BEASTAnd from my roost I could note the passing of anything bigger than a buffalo yearling, within a radius of at least six miles.
Raw Gold | Bertrand W. SinclairSome of them, stronger than others, sent roots for a radius of a hundred miles, others for a few leagues and no more.
Old Friends Are the Best | Jack SharkeyGeneral Steuben observing the large radius of camp concluded that Cornwallis' entire force was across the river.
Hallowed Heritage: The Life of Virginia | Dorothy M. TorpeyThere are a good many neighbours within a radius of five miles; the trains to town are not all that could be wished.
The Daughters of Danaus | Mona CairdA very dense fog enveloped everything, confining the view of surrounding objects to a radius of about fifty yards.
British Dictionary definitions for radius
/ (ˈreɪdɪəs) /
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
Origin of radius
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for radius
[ rā′dē-əs ]
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Browse