infrasonic /in-frə-sonˈik/ (acoustics)

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

inˈfrasound noun

• sacerdotalizes
• sacerdotalizing
• sacerdotally
• sachem
• sachemdom
• sachemdoms
• sachemic
• sachems
• sachemship
• sachemships
• Sacher torte
• Sachertorte
• sachet
• sachets
• sack
• sackable
• sackage
• sackages
• sackbut
• sackbuts
• sackcloth
• sackcloths
• sack-doudling
• sack dress
• sacked