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a colorless corrosive fuming usually gaseous compound HF that yields hydrofluoric acid when dissolved in water, vesiniku ja fluori ühend, valem HF; vees hästilahustuv mürgine gaas (lahuses esineb peamiselt dimeeridena H2F2)
an acidic, extremely corrosive solution of the liquid hydrogen fluoride in water, keskmise tugevusega mürgine hape, mis tekib vesinikfluoriidi lahustumisel vees