A chemical salt or compound containing two fluoride ions or two fluorine atoms per molecule.
From 'bi-' (two) plus 'fluoride.' The spelling variant 'bifluoride' is the more common form in modern chemistry.
Ammonium bifluoride is used to etch glass—it's literally a chemical version of a two-pronged attack where the two fluorines together dissolve silica in ways one fluorine alone could never manage!
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