photodrome \pho"to*drome\ (f[=o]"t[-o]*dr[=o]m), n. [Photo- +
Gr. dramei^n to run.] (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.
[1913 Webster]