ultrasonicEnglishOxford New American Dictionaryultrasonic /ˌəltrəˈsänik, ˌəltrəˈsɑnɪk / ▸ adjective of or involving sound waves with a frequency above the upper limit of human hearing. – DERIVATIVES ultrasonically /ˌəltrəˈsänək(ə)lē , ˌəltrəˈsɑnək(ə)li / adverb