(n.) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights or their relative illuminating power.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Photometer. Retrieved September 25, 2026, from http://smartdefine.org/photometer/definitions/2044984 |
| Chicago | Webster's. 2011. "Photometer" http://smartdefine.org/photometer/definitions/2044984 (accessed September 25, 2026). |
| Harvard | Webster's 2011, Photometer, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/photometer/definitions/2044984>. |
| MLA | Webster's. "Photometer" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/photometer/definitions/2044984> |