Actually an isolated storage inductor, a flyback transformer is a combination of an isolating transformer, output inductor, and flywheel diode. These use a gapped core and have a power handling capability of 100VA. Storing energy in the gap when the switch is on and delivering energy to the load when the switch is off, they do not perform like standard transformers.

a flyback circuit uses the flyback action of an inductor or a flyback transformer to convert the input voltage and current to the desired output voltage and current

When the current flowing through an inductor is cut off the energy stored in the magnetic field is released by a sudden reversal of the terminal voltage. If a diode is in place to conduct the stored energy somewhere useful, the diode is called a flyback diode. This only requires one winding on the inductor, so the inductor would be called a flyback transformer. This arrangement has the interesting property of transferring energy to the secondary side of the power supply only when the primary switch is off. Such switchmode power supplies are called flyback converters.

The movement of the hand of a chronograph subdial that returns to zero when a chronograph button is depressed.

This phrase is often used to describe two different functions of a chronograph watch. Some use it to describe the function of depressing a chronograph button which returns the seconds hand to zero but immediately starts the timing again. Also (probably wrongly) used to describe the split seconds chronograph which has two seconds hands sitting atop one another. On depression of a third chronograph button (most have two), the flyback hand will stop in order to measure say, a lap time; repressing this button with cause the flyback hand to flyback(!) to the other seconds hand which has remained in motion.

An additional hand on a chronograph which moves with the second hand but, can be stopped independently to measure an interval which can then "fly back" to catch up with the other hand. This is useful for capturing lap times without losing the ability to capture the finish time.

A coat of fur which flies back to its smooth normal position when stroked from the hindquarters to the shoulders.

It is a term used when the electron beam in a cathode ray tube returns back to its starting point after completing a line in a television picture or of a trace in an oscilloscope.

A movement similar to a reversing line feed.