noun
: any of several salts made usually by reaction of hydrofluoric acid with potassium carbonate: as
a. : the hygroscopic crystalline normal salt KF used chiefly as a solder flux and as a fluorinating agent in organic synthesis
b. or potassium bifluoride : the poisonous corrosive crystalline acid fluoride KHF 2 used chiefly as an electrolyte in the manufacture of fluorine and as a solder flux : potassium hydrogen fluoride