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18.117.11.13
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From: Webster's Revised Unabridged Dictionary (1913)

 Di·op·tric Di·op·tric·al a.  Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope. “Dioptrical principles.”
 Dioptric curve Geom., a Cartesian oval. See under Cartesian.
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