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A wave phenomenon sharing the physical nature of sound but with a range of frequencies below that of human hearing.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(General Physics) soundlike waves having a frequency below the audible range, that is, below about 16Hz
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Sound whose wave frequency is too low (under 20 hertz) to be heard by humans.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
infrasound[ˈɪnfrəˌsaʊnd] N → infrasonido m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
infrasound[ˈɪnfrəˌsaʊnd] n (Phys) → infrasuono
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995