noting or pertaining to a sound wave with a frequency below the audio-frequency range.

1925–30; infra- + sonic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infrasound (ˈɪnfrəˌsaʊnd)
soundlike waves having a frequency below the audible range, that is, below about 16Hz

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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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.
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Example sentences
The atmospheric structure responsible for the transport of infrasonic energy can change rapidly in both time and space.
Infrasonic sound is always present in the environment.
Infrasonic and near-infrasonic signatures may provide advanced warning and monitoring of these extreme events.
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