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[in-fruh-son-ik] /ˌɪn frəˈsɒn ɪk/
noting or pertaining to a sound wave with a frequency below the audio-frequency range.
Origin of infrasonic
1925-30; infra- + sonic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for infrasonic
  • The atmospheric structure responsible for the transport of infrasonic energy can change rapidly in both time and space.
  • infrasonic and near-infrasonic signatures may provide advanced warning and monitoring of these extreme events.
  • infrasonic sound is always present in the environment.
Word Origin and History for infrasonic

1927, from infra- + sonic.

Online Etymology Dictionary, © 2010 Douglas Harper
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infrasonic in Medicine

infrasonic in·fra·son·ic (ĭn'frə-sŏn'ĭk)
Generating or using waves or vibrations with frequencies below that of audible sound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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infrasonic in Science
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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