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episcotister
or ±ð·±è¾±²õ·°ì´Ç·³Ù¾±²õ³Ù·±ð°ù
[ uh-pis-kuh-tis-ter, ep-i-skuh-tis-ter ]
noun
- 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.
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˜yÐÄvlog History and Origins
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