radius Meaning in the Cambridge English Dictionary
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Meaning of “radius” in the English Dictionary

"radius" in British English

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radiusnoun [C]

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

radius noun [C] (DISTANCE)

(the ​length of) a ​straightlinejoining the ​centre of a ​circle to ​itsedge or the ​centre of a sphere to ​itssurface: The radius of this ​wheel is 30 cm.. This ​wheel has a radius of 30 cm. a ​distance from a ​centralpoint: The ​station, ​shoppingcentre and ​schoollie within a one-mile radius of the ​house.

radius noun [C] (BONE)

specialized anatomy the ​thicker of the two ​bones in the ​lowerarm
(Definition of radius from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radius" in American English

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radiusnoun [C]

 us   /ˈreɪ·di·əs/ (plural radii  /ˈreɪ·diˌɑɪ/ )
geometry (the ​length of) a ​straightline from the ​center of a ​circle to ​itsedge: The ​supermarket, ​shoppingmall, and ​school are all within a one-mile radius of the ​house (= are all less than a ​mile away from it).
(Definition of radius from the Cambridge Academic Content Dictionary © Cambridge University Press)
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