di·op·tri·cal /-trɪkəl/ 形容詞
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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