infrasonics

[in-fruh-son-iks]
noun (used with a singular verb)
the branch of science that deals with infrasonic phenomena.

Origin:
1965–70; see infrasonic, -ics

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

infrasonics

vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear-i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations that complete one cycle in 100 seconds or longer.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Infrasonics is the study of sound below the range of human hearing.
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