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

• dinotheriums
• dinoturbation
• dinoturbations
• dins
• dint
• dinted
• dinting
• dints
• diocesan
• diocesans
• diocese
• dioceses
• diode
• diodes
• Diodon
• Dioecia
• dioecious
• dioecism
• dioecisms
• dioestrus
• dioestruses
• Diogenic
• diol
• diols
• Dionaea