Infra sonic

infrasonic

[in-fruh-son-ik]
adjective
noting or pertaining to a sound wave with a frequency below the audio-frequency range.

Origin:
1925–30; infra- + sonic

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American Heritage
Medical Dictionary

infrasonic in·fra·son·ic (ĭn'frə-sŏn'ĭk)
adj.
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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