Definition of: fluorine

(fl′ə·rēn, -rin) noun
A pale yellow, toxic, corrosive gaseous element (symbol F, atomic number 9), the most electronegative and reactive of all elements. See PERIODIC TABLE.

flu·o·rite (fl′ə·rīt) noun
A cleavable, isometric, variously colored calcium fluoride, CaF₂: used as a flux in making steel and glass: also called fluor, fluorspar.

fluoro- combining form
1. Chem. Indicating the presence of fluorine in a compound.
2. Fluorescence: fluoroscope: also, before vowels, fluor-, as in fluoride.

flu·o·ro·car·bon (fl′ə·rō·kär′bən) noun Chem.
Any of a group of very stable compounds in which hydrogen has been replaced by fluorine: used as solvents, lubricants, and insulators.

flu·or·o·chem·i·cal (fl′ə·rō·kem′ə·kəl) noun
Any of various chemicals containing fluorine, as the fluorocarbons.

flu·or·om·e·try (fl′ə·rom′ə·trē) noun
The measurement of the color and intensity of fluorescence.

fluor·o·scope (flr′ə·skōp, fl′ər·ə-) noun
A device for observing, by means of some fluorescent substance, the shadows of objects enclosed in media opaque to ordinary light, but transparent to X-rays.
—fluor′o·scop′ic (-skop′ik) adjective

fluor·os·co·py (flr·os′kə·pē, fl′ə·ros′-) noun
Examination conducted by means of a fluoroscope.

flu·or·o·sis (fl′ə·rō′sis, fl·rō′-) noun Pathol.
Chronic poisoning with fluorine.

flu·or·spar (fl′ôr·spär′, fl′ər-) noun
Fluorite.