synchroscope
synch·ros·cope
noun
1.
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)
Origin
From synchro- + -scope, from syn- + chrono- + -scope, from Ancient Greek σύν (sún)+χρόνος (khrónos)+σκοπέω (skopéō).
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.