longitudinal wave
noun/ˌlɒŋɡɪˌtjuːdənl ˈweɪv/, /ˌlɒndʒɪˌtjuːdənl ˈweɪv/
/ˌlɑːndʒəˌtuːdənl ˈweɪv/
(physics)- a wave that vibrates in the direction that it is moving compare transverse wave
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longitudinal wave