sound with frequencies below the audible range.

1925–30; infra- + sound1 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
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
Motion sickness is caused by exposure to infrasound.
The same gear also gathered data on air pressure and humidity, but those factors had little effect on infrasound transmission.
Some giraffe sounds, called infrasound, cannot be heard by humans.
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