Plural of fluor; fluorescent materials or fluorine-containing compounds used in various industrial and scientific applications.
From Latin 'fluor' (meaning 'flow'), so named because fluorite (the mineral containing fluorine) flows at lower temperatures than other minerals.
The word 'fluor' comes from medieval metallurgists who noticed that certain stones helped metals flow better during smelting—they were literally watching fluorite act as a flux, and the element fluorine got its name from this helpful flowing action.
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