(n.) A non-metallic, gaseous element, strongly acid or negative or associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepared nor kept in glass vessels. If set free it immediately attacks the containing material, so that it was not isolated until 1886. It is a pungent, corrosive, colorless gas. Symbol F. Atomic weight 19.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). fluorine. Retrieved September 22, 2026, from http://smartdefine.org/fluorine/definitions/2008941 |
| Chicago | Webster's. 2011. "fluorine" http://smartdefine.org/fluorine/definitions/2008941 (accessed September 22, 2026). |
| Harvard | Webster's 2011, fluorine, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/fluorine/definitions/2008941>. |
| MLA | Webster's. "fluorine" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/fluorine/definitions/2008941> |