infrasonic /in-frə-sonˈik/ (acoustics)

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

• tannery
• tannest
• tannic
• tannic acid
• tannin
• tanning
• tannings
• tannins
• tannish
• Tannoy
• Tannoyed
• Tannoying
• Tannoys
• tan ooze
• tan pickle
• tan pit
• tan pits
• tanrec
• tanrecs
• tan ride
• tan rides
• tans
• tansies
• tan someone's hide
• tansy