(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Dioptrical. Retrieved September 25, 2026, from http://smartdefine.org/dioptrical/definitions/1997849 |
| Chicago | Webster's. 2011. "Dioptrical" http://smartdefine.org/dioptrical/definitions/1997849 (accessed September 25, 2026). |
| Harvard | Webster's 2011, Dioptrical, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/dioptrical/definitions/1997849>. |
| MLA | Webster's. "Dioptrical" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/dioptrical/definitions/1997849> |