adjective
EXAMPLES FROM OTHER ENTRIES
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subsonic aircraft
EXAMPLES FROM CORPUS
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A lot of dance music is using sub bass, subsonic sounds.
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Sure enough, he could make out the same almost subsonic throbbing as he had heard earlier.
SUBSONIC
Meaning of SUBSONIC in English
Longman DOCE5 Extras English vocabulary. Дополнительный английский словарь Longman DOCE5. 2012