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synchro unit

American  
[sing-kroh] / ˈsɪŋ kroʊ /

noun

Electricity.
  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.


Etymology

Origin of synchro unit

synchro, shortened form of synchronous