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[floo-res-uh ns, flaw-, floh-] /flʊˈrɛs əns, flɔ-, floʊ-/

noun, Physics, Chemistry.
the emission of radiation, especially of visible light, by a substance during exposure to external radiation, as light or x-rays.
Compare (def 1).
the property possessed by a substance capable of such emission.
the radiation so produced.

the radiation emitted as a result of fluorescence Compare phosphorescence

1852, “glowing in ultraviolet light,” coined by English mathematician and physicist Sir George G. Stokes (1819-1903) from fluorspar (see fluorine), because in it he first noticed the phenomenon, + -escence, on analogy of phosphorescence.

fluorescence fluo·res·cence (flu-rěs’əns, flô-)

fluo·res’cent adj.

The emission of light from an object as a result of bombardment by other kinds of electromagnetic radiation, such as x-rays or ultraviolet rays. Fluorescent materials may appear one color when bathed in visible light and another color when exposed to other kinds of electromagnetic radiation.

Note: “Black light” depends on fluorescence for its effects.


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