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in the PONS Dictionary

ra·dius <pl -dii> [ˈreɪdiəs, pl -diaɪ] N

1. radius MATH:

radius
Radius m <-, Ra̱·di·en>

2. radius (distance from centre):

radius
Radius m <-, Ra̱·di·en>
within a radius of 10 miles
in einem Umkreis von 10 Meilen
radius of action
Aktionsradius m <-, -radien>
radius of action
Wirkungsbereich m <-(e)s, -e>

3. radius ANAT:

radius
Speiche f <-, -n>

ˈturn·ing ra·dius N esp Am AUTO

turning radius
Wendekreis m <-es, -e>
turning radius
Wenderadius m
OpenDict entry

Bohr radius N

Bohr radius (physical constant) PHYS
Bohr'scher Radius
OpenDict entry

radius vector N

radius vector MATH
Radiusvektor m