Množina: fluors

ETYM Latin, a flowing, from fluere to flow. Related to Fluent.
See.

Množina: fluoresceins

A yellow dye that is visible even when highly diluted; SYN. fluoresceine, fluorescent dye, resorcinolphthalein.

Množina: fluorescences

ETYM From Fluor.
In scientific usage, very short-lived luminescence (a glow not caused by high temperature). Generally, the term is used for any luminescence regardless of the persistence. Phosphorescence lasts a little longer.
Fluorescence is used in strip and other lighting, and was developed rapidly during World War II because it was a more efficient means of illumination than the incandescent lamp. Recently, small bulb-size fluorescence lamps have reached the market. It is claimed that, if widely used, their greater efficiency could reduce demand for electricity. Other important applications are in fluorescent screens for television and cathode-ray tubes.
Light emitted during absorption of radiation of some other (invisible) wavelength.

1. Brilliantly colored and apparently giving off light.
2. Emitting light during exposure to radiation from an external source.

Množina: fluorines

ETYM New Lat. fluorina: cf. German fluorin, French fluorine. So called from its occurrence in the mineral fluorite.
A nonmetallic univalent element; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite; SYN. F, atomic number 9.
Pale yellow, gaseous, nonmetallic element, symbol F, atomic number 9, atomic weight 19. It is the first member of the halogen group of elements, and is pungent, poisonous, and highly reactive, uniting directly with nearly all the elements. It occurs naturally as the minerals fluorite (CaF2) and cryolite (Na3AlF6). Hydrogen fluoride is used in etching glass, and the freons, which all contain fluorine, are widely used as refrigerants.
Fluorine was discovered by the Swedish chemist Karl Scheele in 1771 and isolated by the French chemist Henri Moissan in 1886.
Combined with uranium as UF6, it is used in the separation of uranium isotopes.