(a.) Capable of luminescence under the action of cathode rays, X rays or any of the allied forms of radiation.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). radio-active. Retrieved September 21, 2026, from http://smartdefine.org/radio-active/definitions/2052302 |
| Chicago | Webster's. 2011. "radio-active" http://smartdefine.org/radio-active/definitions/2052302 (accessed September 21, 2026). |
| Harvard | Webster's 2011, radio-active, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/radio-active/definitions/2052302>. |
| MLA | Webster's. "radio-active" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/radio-active/definitions/2052302> |