stroboscope

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stro·bo·scope / ˈstrōbəˌskōp/ • n. Physics an instrument for studying periodic motion or determining speeds of rotation by shining a momentary bright light at intervals so that a moving object appears stationary. ∎  a lamp made to flash intermittently, esp. for this purpose.DERIVATIVES: stro·bo·scop·ic / ˌstrōbəˈskäpik/ adj.stro·bo·scop·i·cal·ly / ˌstrōbəˈskäpik(ə)lē/ adv.

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