Hydrofluoric-acid meaning

hīdrō-flo͝orĭk, -flôr-
A colorless, fuming, corrosive, dangerously poisonous aqueous solution of hydrogen fluoride, HF, used to etch or polish glass, pickle certain metals, and clean masonry.
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A strong, fuming acid that is a water solution of the gas, or liquid, hydrogen fluoride (H6F6, H4F4, H2F2, or HF, depending on the temperature): it reacts with silicates and is used in etching glass.
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A colorless, fuming, aqueous solution of hydrogen fluoride. It is corrosive and is used to etch or polish glass, to clean certain metals before plating, and to clean masonry. It is very poisonous.
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(chemistry) A solution of hydrogen fluoride, HF, in water; it is a weak but very corrosive acid, used in the production of fluorine compounds, and in metallurgy.
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Origin of hydrofluoric-acid