Webster’s Revised Unabridged Dictionary · 1913
Stroboscope
Strob′o·scope (·ō·skōp), n. [Gr. ? a whirling + -scope.] 1. An instrument for studying or observing the successive phases of a periodic or varying motion by means of light which is periodically interrupted.
2. An optical toy similar to the phenakistoscope. See Phenakistoscope.