noun
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
• Derivationally related forms: ↑synchronize (for: ↑synchronizer), ↑synchronise (for: ↑synchroniser)
• Hypernyms: ↑measuring instrument, ↑measuring system, ↑measuring device
Useful english dictionary. 2012.