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wave. 1  a disturbance on the surface of a liquid body, as the sea or a lake, in the form of a moving ridge or swell. 2  any surging or progressing movement or part resembling a wave of the sea: a wave of the pulse.
A ray is a thin beam of light that travels in a straight line. A wave front is the line (not necessarily straight) or surface connecting all the light that left a source at the same time. For a source like the Sun, rays radiate out in all directions; the wave fronts are spheres centered on the Sun.