Definition of fluor acid air in US English:

fluor acid air

noun

Chemistry
historical
  • A colourless gas produced by Priestley in experiments with fluorspar, probably mainly silicon tetrafluoride (SiF₄) resulting from the reaction of hydrofluoric acid with glass.

Origin

Late 18th century; earliest use found in Joseph Priestley (1733–1804), theologian and natural philosopher.