ul·tra·son·ic 
(ŭl′trə-sŏnĭk)
(ŭl′trə-sŏnĭk)adj.
1. Of or relating to acoustic frequencies above the range audible to the human ear, or above approximately 20,000 hertz.
2. Of, relating to, or involving ultrasound.
ul′tra·soni·cal·ly adv.
- insuperably
- insupportable
- insupportably
- insuppressible
- insuppressibly
- insurability
- insurable
- insurance
- insure
- insured
- insurer
- insurgence
- insurgency
- insurgent
- insurgently
- insurmountability
- insurmountable
- insurmountableness
- insurmountably
- insurrection
- insurrectional
- insurrectionary
- insurrectionism
- insurrectionist
- insusceptibility