look up any word, like trill:
 
1.
Half the diameter of a circle
If the diameter is 100, the radius is therefore 50.
by iDior February 12, 2008
 
2.
The strong unexplainable pull of one's "pick-up abilities" on a girl of choice that is in said radius.
Sally was in the midst of John's radius last night;so she inevitably had sex with him
by sodumc February 25, 2009