Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Generating or using waves or vibrations with frequencies below that of audible sound.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective of sound waves, acoustics Having frequencies below the human audible range
  • adjective of a device Generating or employing such sound waves

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having frequencies below those of audible sound

Etymologies

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Examples

  • However, technological advances are making it possible to develop WMD based on qualitatively new principles, such as infrasonic (acoustic), radiological (enhanced-radiation), or particle-beam weapons.

    FM 100-61 Chptr 14 NBC and Smoke Support United States Army 1998

  • However, technological advances are making it possible to develop WMD based on qualitatively new principles, such as infrasonic (acoustic), radiological (enhanced-radiation), or particle-beam weapons.

    FM 100-61 Chptr 14 NBC and Smoke Support United States Army 1998

  • Although we cannot hear these "infrasonic" waves - which have frequencies ranging from 0. 01-10 Hz - we know they exist from acoustic recordings around the globe.

    physicsworld.com: all content 2009

  • Georgia Tech's center is testing highly sensitive "infrasonic" microphones that pick up sounds whose frequencies are too low to be detected by the human ear.

    Technology Offers Hope for Detecting Tornadoes Sooner Cameron McWhirter 2011

  • They may also use the infrasonic roar of distant ocean waves or wind in far-off mountains as acoustic landmarks.

    Birdology Sy Montgomery 2010

  • Many animals, including birds, almost certainly hear infrasound; birds might even use the infrasonic rumblings of the ocean or the shifting plates of the earth to help navigate on their migrations.

    Birdology Sy Montgomery 2010

  • What will hit us is noise, both the audible and the infrasonic, shadow-flicker, ice throw, and the deaths of birds and bats in our preserved fly way.

    The Volokh Conspiracy » MIT’s Lindzen on “ClimateGate” 2009

  • HSBC makes a good point that seismological evidence as well as infrasonic data would be of great value in determining the authenticity of the claim.

    Impact in Latvia Creates 20-Meter Crater | Universe Today 2009

  • Eruptive phenomena are monitored 24/7 and in all weather conditions with continuously transmitting seismic and infrasonic instruments designed to distinguish explosive, ash-producing eruptions from volcanic earthquakes and tremor without ash production.

    Impact of Volcanic Activity on Airports 2009

  • There was some debate about elephants congregating as if through magic, but then it was discovered that they were communicating through infrasonic sound waves.

    Telekinesis and Quantum Field Theory Sean 2008

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