| dioptrical | 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. <geometry> " Dioptric curve, a Cartesian oval. See Cartesian. Origin: Gr. Belonging to the use of the; = through + the root of I shall see: cf. F. Dioptrique. Source: Websters Dictionary (01 Mar 1998) |
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