longitudinal waves'

longitudinal wave

noun Physics.
a wave in which the direction of displacement is the same as the direction of propagation, as a sound wave.
Compare transverse wave.


Origin:
1930–35

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World English Dictionary
longitudinal wave
 
n
Compare transverse wave a wave that is propagated in the same direction as the displacement of the transmitting medium

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
longitudinal wave  
A wave that oscillates back and forth on an axis that is the same as the axis along which the wave propagates. sound waves are longitudinal waves, since the air molecules are displaced forward and backward on the same axis along which the sound travels. Compare transverse wave. See more at wave.
The American Heritage® Science Dictionary
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