define ray
mean what
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a thing that is arranged radially
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A ray is a line with an endpoint that extends infinitely in one direction. One of the most obvious examples is a sun's ray of light in space. Let's look at how light from the sun originates and travels:

The light originates from the sun, and its path extends infinitely (assuming there's nothing to block it). Why do we refer to the light from the sun as sun rays? Why not sun lines? After all, light does travel in a line. However, unlike a ray of light in space, a line has two endpoints. We call this a sun ray because it has only one endpoint (the sun) and extends infinitely in one direction.
Here's tennis player Tommy Haas about to serve:
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