fluoride has definitions from the field of chemistry
[ noun ] (chemistry) a salt of hydrofluoric acid

Used in print

(1961 Research Highlights of the National Bureau of...)

This work gave a heat_of_formation of aluminum fluoride which closely substantiates a value which had been determined by a less direct method , and raises this property to 15 percent above that accepted a_few years ago .

Similar measurements are being initiated to resolve a large discrepancy in the heat_of_formation of another important combustion product , beryllium fluoride .