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From: Webster's Revised Unabridged Dictionary (1913)

 pho·to·drome n.  Physics An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk.  By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction.
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