white noise

noun
1.
Also called white sound. a steady, unvarying, unobtrusive sound, as an electronically produced drone or the sound of rain, used to mask or obliterate unwanted sounds.
2.
Physics. random noise with a uniform frequency spectrum over a wide range of frequencies.

Origin:
1965–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
white noise
 
n
a.  sound or electrical noise that has a relatively wide continuous range of frequencies of uniform intensity
 b.  noise containing all frequencies rising in level by six decibels every octave

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Another test asked participants to work out the direction of specific sounds
  embedded within white noise.
Another test asked participants to work out the direction of specific sounds
  embedded within stereo white noise.
Next you expose it to a burst of white noise, which predictably makes it jump.
Then you accompany the white noise with the light flash, and now the rat jumps
  higher than it does when it hears the noise alone.
Image for white noise
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