radius - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “radius”

See all translations

radius

noun [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

lateral thinking

a way of solving a problem by thinking about it in a different and original way and not using traditional or expected methods

Word of the Day

What’s All The Commotion About? (Words to describe sounds)

by Kate Woodford,
May 20, 2015
​​​ In this post we look at a range of words and phrases that we use to describe noise and the absence of noise. Starting with complete quiet, we sometimes use the noun hush to describe silence: A hush fell over the room as the bride walked in./There was a deathly hush (=complete

Read More 

plyscraper noun

May 18, 2015
a skyscraper made mainly from wood The development of engineered timber could herald a new era of eco-friendly ‘plyscrapers’. Christchurch welcomed its first multistorey timber structure this year, there are plans for Vancouver, and the talk is China could follow

Read More