What does ultrasonic mean?
ultrasonic
Definition
Working with sound waves too high for people to hear — in a humidifier, they shake water into a fine cool mist.
Example sentences
We got an ultrasonic humidifier for the baby's room, and you can't even hear it running.
We got an ultrasonic humidifier for the baby's room, and you can't even hear it running.
Ultrasonic humidifiers leave a fine white dust on the furniture if you fill them with tap water.
Ultrasonic humidifiers leave a fine white dust on the furniture if you fill them with tap water.