thermal noise

noun Thermodynamics, Electricity.
a wide spectrum of electromagnetic noise appearing in electronic circuits and devices as a result of the temperature-dependent random motions of electrons and other charge carriers.
Compare shot effect.


Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thermal noise
 
n
electrical noise caused by thermal agitation of conducting electrons

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
At extremely large distances, the power density can not be distinguished
  separately from thermal noise.
And you can only detect some quantum mechanical effects if you get the thermal
  noise down to vanishingly low levels.
In the terahertz range, however, both quantum and thermal noise are important
  and must be dealt with.
Simulations show that noise cancellation circuits decrease thermal noise and
  increase gain.
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