from
The Collaborative International Dictionary of English v.0.48
Dioptric \Di*op"tric\, Dioptrical \Di*op"tric*al\, a. [Gr. ?
belonging to the use of the ?; ? = dia` through + the root of
? I shall see: cf. F. dioptrique.]
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."
--Nichol.
[1913 Webster]
{Dioptric curve} (Geom.), a Cartesian oval. See under
{Cartesian}.
[1913 Webster]