infrasonic /in-frə-sonˈik/ (acoustics)

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

• fish-hatchery
• fish-hawk
• fish-hawks
• fish-hook
• fish-hooks
• fishier
• fishiest
• fishified
• fishifies
• fishify
• fishifying
• fishiness
• fishinesses
• fishing
• fishing-frog
• fishing-frogs
• fishing ground
• fishing grounds
• fishing-line
• fishing-lines
• fishing-rod
• fishing-rods
• fishings
• fishing-tackle
• fish in troubled waters