Collins
World English Dictionary
white light
 
n
light that contains all the wavelengths of visible light at approximately equal intensities, as in sunlight or the light from white-hot solids

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
white light  
  1. Electromagnetic radiation composed of a fairly even distribution of all of the frequencies in the visible range of the spectrum, appearing white to the eye. Light from the Sun is nearly perfect white light, although the Sun does not itself appear white when viewed on Earth due to the scattering of light with frequencies in the blue range by the atmosphere, leaving the Sun with a yellow color.

  2. Light that appears white to the eye, composed of some combination of light with frequencies in the red, blue, and green parts of the spectrum. See also color.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The rectangular transom above the door to the street shone a dazzling white
  light.
During a film of an actual nuclear test, a flash of white light and bursts of
  air fill the room as the floor vibrates.
So when white light from the sun enters the ocean, it is mostly the blue that
  gets returned.
When combined with the rest of the blue this forms a cool, white light.
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