Meaning of synchro unit

syn'chro u"nit

Pronunciation: (sing'krō), [key]
— Elect. Elect.
  1. a type of alternating-current motor designed to maintain continuously, at some remote location, the same rotational angle that may be imposed by force upon the electrically connected rotating element of a similar motor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.