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infrasound

[in-fruh-sound] /ˈɪn frəˌsaʊnd/
noun
1.
sound with frequencies below the audible range.
Origin
1925-1930
1925-30; infra- + sound1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for infra-sound

infrasound

/ˈɪnfrəˌsaʊnd/
noun
1.
soundlike waves having a frequency below the audible range, that is, below about 16Hz
Derived Forms
infrasonic (ˌɪnfrəˈsɒnɪk) adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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infra-sound in Science
infrasound
  (ĭn'frə-sound')   
Sound whose wave frequency is too low (under 15-20 hertz) to be heard by humans. Some animals, such as elephants and whales, emit calls at infrasound frequencies. See Note at ultrasound.

infrasonic adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
9
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