Definition of autotransformer in English:
 autotransformer
nounɔːtəʊtransˈfɔːməˌôdōtransˈfôrmər
An electrical transformer which has a single winding of which part is common to both primary and secondary circuits.
 Example sentencesExamples
-  They can build autotransformers to any voltage and current required.
 -  If this is actually an autotransformer, then you do not have a separate primary and secondary winding.
 -  This line of autotransformers offers cost effective and reliable means of AC blower motor speed control.
 -  Always connect the autotransformer after the power switch and fuse of the equipment it is installed in.
 -  I am planning to build a 4 input volume control device using an autotransformer and remote control.