[uh-pis-kuh-tis-ter, ep-i-skuh-tis-ter]
a disk with a sector removed that when rotated in front of a light source allows the periodic passage of flashes of light: used in studying the motion of a body.
Also, episkotister.

1900–05; < Greek episkot(ízein) to overshadow (see epi-, scotia, -ize) + -ist + -er1

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