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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
1965-1970
1965-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for white-noise

white noise

noun
1.
  1. sound or electrical noise that has a relatively wide continuous range of frequencies of uniform intensity
  2. noise containing all frequencies rising in level by six decibels every octave
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for white-noise

white noise

n.

"sound made up of a random mixture of frequencies and intensities," attested by 1970.

Online Etymology Dictionary, © 2010 Douglas Harper
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