- (n.) A radioactive isotope of strontium produced by certain nuclear reactions, and constituting one of the prominent harmful components of radioactive fallout from nuclear explosions; also called radiostrontium. It has a half-life of 28 years.
- (n.) A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr. Atomic weight 87.3.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). strontium. Retrieved September 22, 2026, from http://smartdefine.org/strontium/definitions/2067209 |
| Chicago | Webster's. 2011. "strontium" http://smartdefine.org/strontium/definitions/2067209 (accessed September 22, 2026). |
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| MLA | Webster's. "strontium" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/strontium/definitions/2067209> |