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subsonic

adjective  
 
uk
/sʌbˈsɒn.ɪk/
How to pronounce subsonic adjective in British English
 
us
/-ˈsɑː.nɪk/
How to pronounce subsonic adjective in American English
View dictionary definition of subsonic »
(Pronunciation of subsonic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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