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infrasound
in·fra·sound [ ínfrə sòwnd ]


noun 
Definition:
 
sound inaudible to humans: sound at frequencies below 20 Hz, which cannot be heard by humans but can be felt as vibration
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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