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The fluor is believed to make skis faster as it creates a layer that repels moisture and dirt.

Check the ingredients on products you buy and watch for chemical names containing "fluor-." Specific trade names, such as Teflon and Gore-Tex, are also likely to contain PFAS.

A name given to fluor spar in Derbyshire, where it is used for ornamental purposes.

Spar, sp�r, n. a term applied by miners to any bright crystalline mineral, and adopted by mineralogists in the names of a number of minerals—calcareous spar, fluor spar, Iceland spar, &c.—adj.

The nitrous acid may be exhibited in the form of air, as well as the vitriolic, the marine, and the fluor acids.