Definition of fluoboric in US English:

fluoboric

adjective

  • Of fluorine and boron; chiefly in "fluoboric acid"noun (originally) boron trifluoride, BF₃, a corrosive gas with Lewis acid properties, made by the action of hydrofluoric acid on boron oxides; (now) the acid HBF₄, obtained by dissolving boron trifluoride in water.

Origin

Early 19th century; earliest use found in Edinburgh Monthly Magazine. From fluo- + boric (although this is apparently first attested slightly later), after French fluoborique.