Short for fluorine or fluorite; the element or mineral that glows under ultraviolet light.
From Latin 'fluere' meaning 'to flow,' named because fluorite was used as a flux in metalworking. The element fluorine was named after this mineral.
The word 'fluor' comes from the same Latin root as 'fluent' and 'fluid'—because fluorite was liquid or flowed when used in metalworking, it was the original 'flowing' substance!
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