The Schwarzschild radius (sometimes historically referred to as the gravitational radius) is the radius of a sphere such that, if all the mass of an object is compressed within that sphere, the escape speed from the surface of the sphere would equal the speed of light. An example of an object smaller than its Schwarzschild radius is a black hole. ...
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http://en.wikipedia.org/wiki/Schwarzschild_radius
The radius, according to the general theory of relativity, at which a body would become a black hole; alternatively, the radius of the event horizon of a spherical black hole, from within which the strength of gravity is so strong that light cannot escape. Named after Karl Schwarzschild, it is given...
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http://www.daviddarling.info/encyclopedia/S/Schwarzschild_radius.html
The radius r of the event horizon for a Schwarzschild black hole.
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http://www.encyclo.co.uk/local/20040
The Schwarzschild radius is the radius at which the event horizon of a Critical Circumference.
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http://www.encyclo.co.uk/local/20103
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