hydrofluoric acid

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

Origin:
1815–25

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World English Dictionary
hydrofluoric acid (ˌhaɪdrəʊfluːˈɒrɪk)
 
n
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.
The American Heritage® Science Dictionary
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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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