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infrasonic
in·fra·son·ic [ ìnfrə sónnik ]


adjective 
Definition:
 
1. relating to sound inaudible to humans: relating to sound at frequencies below 20 Hz, which cannot be heard by human beings but can be felt as vibration
2. of infrasonic waves or vibrations: using or produced by infrasonic waves or vibrations

in·fra·son·i·cal·ly adverb
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