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From Longman Dictionary of Contemporary English
Related topics: Transport, Measurement
subsonicsub‧son‧ic /ˌsʌbˈsɒnɪk◂ $ -ˈsɑː-/ adjective  TTTMslower than the speed of soundsupersonic
Examples from the Corpus
subsonicsubsonic aircraftA lot of dance music is using sub bass, subsonic sounds.Sure enough, he could make out the same almost subsonic throbbing as he had heard earlier.
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