infrasonic /in-frə-sonˈik/ (acoustics)

1. (of frequencies) below the usual audible limit
2. Of, using or produced by infrasonic vibrations or pressure waves

• herborized
• herborizes
• herborizing
• herbose
• herbous
• herb Paris
• herb Peter
• herb Robert
• herbs
• herb tea
• herb teas
• herb-trinity
• herby
• Herceptin
• hercogamies
• hercogamous
• hercogamy
• Herculean
• Hercules beetle
• Hercules' choice
• Hercules' club
• Hercynian
• hercynite
• hercynites
• herd