fluor Definition

fluor
noun

1. A material that absorbs electrons or radiation, especially ultraviolet light, and converts these into radiation of a different wavelength, usually visible light, which it then emits.
2. fluorspar.

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fluorspar
fluorite
fluor
noun

1. geol.
Calcium fluoride, a mineral that is transparent when pure, but commonly occurs as blue or purple crystals. It is used in glass and some cements, and in the manufacture of hydrofluoric acid for the plastic industry.

Etymology: 18c: from Latin fluor flow (from the use of fluorspar as a flux) + spar².