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infrasonic

[in-fruh-son-ik] /ˌɪn frəˈsɒn ɪk/
adjective
1.
noting or pertaining to a sound wave with a frequency below the audio-frequency range.
Origin
1925-1930
1925-30; infra- + sonic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for infra-sonic

infrasonic

adj.

1927, from infra- + sonic.

Online Etymology Dictionary, © 2010 Douglas Harper
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infra-sonic in Medicine

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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