Meaning of “longitudinal wave” in the English Dictionary

british dictionary

"longitudinal wave" in American English

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longitudinal wavenoun [ C ]

us /ˈlɑn·dʒəˈtu·dən·əl ˈweɪv/

physics a wave in which the substance the wave travels through moves in the same direction of the wave itself. Sound waves are longitudinal waves.

(Definition of “longitudinal wave” from the Cambridge Academic Content Dictionary © Cambridge University Press)