radius Meaning, definition in Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of "radius" - English Dictionary

See all translations

radiusnoun [C]

uk   us   /ˈreɪ.di.əs/ (plural radii )

radius noun [C] (DISTANCE)

(the length of) a straight line joining the centre of a circle to its edge or the centre of a sphere to its surface: The radius of this wheel is 30 cm. This wheel has a radius of 30 cm. a distance from a central point: The station, shopping centre and school lie within a one-mile radius of the house.

radius noun [C] (BONE)

specialized anatomy the thicker of the two bones in the lower arm
(Definition of radius from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of radius?
Add Cambridge dictionaries to your browser to your website

Definitions of “radius” in other dictionaries

Word of the Day
social security

a system of payments made by the government to people who are ill, poor, or who have no job

Word of the Day

Are you a glass-half-full person? (Everyday Idioms)
Are you a glass-half-full person? (Everyday Idioms)
by Kate Woodford,
July 29, 2015
A reader of this blog recently asked for a post on idioms that are used in everyday English. This seemed like a reasonable request. After all, if you are going to make the effort to learn a set of English idioms, you want those idioms to be useful. The question, then, was

Read More 

exoskeleton noun
exoskeleton noun
July 27, 2015
a robotic device which goes around the legs and part of the body of a person who cannot walk and allows them to move independently and in an upright position The device, known as an exoskeleton, is strapped to the outside of a person’s limbs and can then be controlled by them.

Read More