infra-sound

infrasound

[in-fruh-sound]
noun
sound with frequencies below the audible range.

Origin:
1925–30; infra- + sound1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To infra-sound
Collins
World English Dictionary
infrasound (ˈɪnfrəˌsaʊnd)
 
n
soundlike waves having a frequency below the audible range, that is, below about 16Hz
 
infrasonic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
infrasound   (ĭn'frə-sound')  Pronunciation Key 
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.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature