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hydrofluoric acid Definition

hydro·fluoric acid (-flôr′ik, -flo̵or′ik)

noun

a strong, fuming acid that is a water solution of the gas, or liquid, hydrogen fluoride (HF, HF, HF, or HF, depending on the temperature): it reacts with silicates and is therefore used in etching glass

Etymology: hydro- + fluor(ine) + - IC