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)

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 ]

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 ...

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