infrasonic

[ in-fruh-son-ik ]
/ ˌɪn frəˈsɒn ɪk /

adjective

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

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Origin of infrasonic

First recorded in 1925–30; infra- + sonic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for infrasonic

infrasonic
[ ĭn′frə-sŏnĭk ]

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.