from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to acoustic frequencies above the range audible to the human ear, or above approximately 20,000 hertz.
- adj. Of, relating to, or involving ultrasound.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. having frequencies above those of audible sound
Mexican Freetail bats sing mostly in ultrasonic frequencies that are right above the upper limit of human hearing.
It also has the world’s smallest and lightest gyro-sensor and dynamic lift comes from powerful ultra-thin ultrasonic motors and newly designed, optimally shaped main rotors.
I (unintelligible) to the factory and they used a technique called ultrasonic welding to glue plastic components together.
We separate cold air supply and warm air return, and we utilize a process called ultrasonic humidification.
So, remembering that my surgeon said he used a "harmonic scalpel" that vibrates, I googled it and found that the "ultrasonic" blade he used vibrates 55,500 times per second.
This technology is more typically used for industrial applications such as ultrasonic cleaning.
Also worth mentioning is the loan provided by Fundación Paraguaya that was of great help in helping her acquire electronic spare parts for certain devices, such as ultrasonic nebulizers that can be very expensive, and other appliances.
Professor Drinkwater claims that by increasing the size of the shock wave and creating a rotational motion, it will be possible to create a kind of ultrasonic "force field" that would have the power to undo screws.
Staff Reporter National-level symposium on 'ultrasonic' conducted at VIT
We call this sound 'ultrasonic' since it's beyond our range, but it is within the sonic range for many animals in our local environment, including dogs.