white-noise

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

Dictionary.com Unabridged
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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