hydrofluoric acid

a colorless, fuming, corrosive liquid, HF, an aqueous solution of hydrogen fluoride, used chiefly for etching glass.


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World English Dictionary
hydrofluoric acid (ˌhaɪdrəʊfluːˈɒrɪk)
the colourless aqueous solution of hydrogen fluoride: a strong acid that attacks glass

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American Heritage
Science Dictionary
hydrofluoric acid   (hī'drō-flr'ĭk, -flôr'-)  Pronunciation Key 
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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Example sentences
Information on hydrofluoric acid, a potential agent for chemical terrorism.
Hydrofluoric acid is a colorless, fuming liquid or gas with a pungent odor.
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