Extremely fast or sudden; moving (as if) at the speed of lightning.
A flash of light produced by short-duration, high-voltage discharge of electricity within a cloud, between clouds, or between a cloud and the earth.
Anything that moves very fast.
A discharge of this kind.
To produce lightning.
Greater than the speed of sound (in the same medium, and at the same temperature and pressure).
Ultrasonic, having a frequency too high to be audible.
An aircraft that can travel at the speed of sound.