Main Entry: ul·tra·son·ic

Pronunciation: \-ˈsä-nik\

Function: adjective

Date: 1923

1 : having a frequency above the human ear's audibility limit of about 20,000 hertz —used of waves and vibrations
2 : utilizing, produced by, or relating to ultrasonic waves or vibrations <ultrasonic testing of metal>

— ul·tra·son·i·cal·ly \-ni-k(ə-)lē\ adverb