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Definition of fluorine : 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.

Synonyms:

farad, degree Fahrenheit, F, atomic number 9

europium, iridium, cobalt, zinc, neon, arsenic, carbon, argon, beryllium, silver, polonium, boron, promethium, platinum, antimony, radium, americium, chlorine, sulfur, mendelevium, tellurium, cadmium, erbium, copper, technetium, praseodymium, magnesium, cesium, fermium, gold, nickel, oxygen, lithium, thallium, palladium, mercury, californium, rhodium, xenon, berkelium, curium, thulium, ruthenium, lutetium, germanium, nitrogen, manganese, molybdenum, krypton, uranium, phosphorus, tin, bromine, terbium, cerium, lanthanum, niobium, hydrogen, scandium, potassium, rubidium, thorium, holmium, osmium, strontium, indium, iodine, neptunium, hafnium, helium, vanadium, sodium, bismuth, neodymium, rhenium, ytterbium, einsteinium, gallium, calcium, nobelium, plutonium, titanium, dysprosium, lead, gadolinium, iron, chromium, selenium, aluminum, yttrium, tungsten, silicon, astatine, actinium, tantalum, francium, barium, radon, zirconium, samarium, element, protactinium

Usage examples:

• The primary manganese minerals probably owe their origin to hot magmatic solutions, as suggested by the close association of the ores with the igneous rock, the presence of minerals containing chlorine, fluorine, and boron, and the development in the limestone of dense silicates and mineral associations characteristic of hot- water alteration. - "The Economic Aspect of Geology", C. K. Leith.
• Von Schlichten noticed that a few of his more recent quartz- specks were slightly greenish in tinge, a sure sign that he had, not long ago, been exposed to the fluorine- tainted air which men and geeks alike breathed on Niflheim. - "Uller Uprising", Henry Beam Piper, John D. Clark and John F. Carr.
• Except that I don't think it's right to employ any people with silicone body- tissues where they're going to breathe fluorine- tainted air. - "Uller Uprising", Henry Beam Piper, John D. Clark and John F. Carr.