(a.) Having the same foci; as, confocal quadrics.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). confocal. Retrieved September 20, 2026, from http://smartdefine.org/confocal/definitions/1990290 |
| Chicago | Webster's. 2011. "confocal" http://smartdefine.org/confocal/definitions/1990290 (accessed September 20, 2026). |
| Harvard | Webster's 2011, confocal, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/confocal/definitions/1990290>. |
| MLA | Webster's. "confocal" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/confocal/definitions/1990290> |