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

• trichomoniasis
• trichophyton
• trichophytons
• trichophytoses
• trichophytosis
• Trichoptera
• trichopteran
• trichopterans
• trichopterist
• trichopterists
• trichopterous
• trichord
• trichords
• trichoses
• trichosis
• trichotillomania
• trichotomies
• trichotomise
• trichotomised
• trichotomises
• trichotomising
• trichotomize
• trichotomized
• trichotomizes
• trichotomizing