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Noun: infrasound  'in-fru,sawnd
  1. (physics) sound waves having frequency below the human audible range (below about 20 Hz)

Encyclopedia: Infrasound

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infrared
infrared emission
infrared frequency
infrared lamp
infrared light
infrared radiation
infrared ray
infrared spectrum
infrared therapy
infrasonic
infrasound
infrastructure
infrequency
infrequent
infrequently
infrigidation
infringe
infringement
infringement of copyright
infructescence
infructuous