(n.) A small instrument containing a minute particle of a radium compound mounted in front of a fluorescent screen and viewed with magnifying lenses. The tiny flashes produced by the continual bombardment of the screen by the / rays are thus rendered visible.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). spinthariscope. Retrieved September 27, 2026, from http://smartdefine.org/spinthariscope/definitions/2064969 |
| Chicago | Webster's. 2011. "spinthariscope" http://smartdefine.org/spinthariscope/definitions/2064969 (accessed September 27, 2026). |
| Harvard | Webster's 2011, spinthariscope, Smart Define, viewed 27 September, 2026, <http://smartdefine.org/spinthariscope/definitions/2064969>. |
| MLA | Webster's. "spinthariscope" 28 May 2011. Web. 27 September 2026. <http://smartdefine.org/spinthariscope/definitions/2064969> |