Definitions for longitudinal wave
This page provides all possible meanings and translations of the word longitudinal wave
Random House Webster's College Dictionary
a wave in which the direction of displacement is the same as the direction of propagation, as a sound wave.
Longitudinal waves, also known as "l-waves", are waves whose direction of vibration is the same as their direction of travel, meaning that the movement of the medium is in the same direction as, or the opposite direction to, the motion of the wave. Mechanical longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium.
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"longitudinal wave." Definitions.net. STANDS4 LLC, 2014. Web. 30 Aug. 2014. <http://www.definitions.net/definition/longitudinal wave>.