supersound

plural supersounds

1. ultrasonic sound

   Bats use supersounds as a substitute for eyes. When a maze of silk threads was strung across a room, bats negotiated the maze at high speed without touching a thread.

   1947, Science Illustrated, volume 2, page 32

   2 more examples

   The most promising industrial application of supersounds lies in what the scientist calls colloid chemistry[…] In the laboratory, supersounds speed up chemical reactions, mix substances that in the past would not join together[…]

   1946, Amacom, American Management Association, Management Review, volumes 35-36, page 155

   If an unexposed photographic plate is submerged in distilled water, subjected to the action of supersound and then developed, the plate will be found to have darkened as if it had been exposed.

   2001, B. Kudryavtsev, Sounds We Cannot Hear, page 80