sound wave

noun Physics.
a longitudinal wave in an elastic medium, especially a wave producing an audible sensation.

Origin:
1865–70

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World English Dictionary
sound wave
 
n
a wave that propagates sound

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Reflections from undersea organisms, such as whales, can disrupt the sound
  wave's path.
The quantization of this sound wave leads to phonons.
The pressure at a fixed point swings from low to high and back as the sound
  wave sweeps by.
If there are no ears to hear the sound wave, it still exists.
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