An instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)

Wiktionary Word definitions in Wiktionary
n. 1 An instrument that indicates the degree to which two alternating current systems are synchronised with each other; used especially in electricity generation 2 An instrument used to synchronise the propellers of a twin-engine aircraft

Wikipedia Word definitions in Wikipedia
In AC electrical power systems, a synchroscope is a device that indicates the degree to which two systems ( generators or power networks ) are synchronized with each other. For two electrical systems to be synchronized, both systems must operate at the ...

WordNet Word definitions in WordNet
n. an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines) [syn: synchronoscope , synchronizer , synchroniser ]