hydrofluoric acid
hy·dro·flu·or·ic acid
noun \-ˌflu̇r-ik-, -ˌflōr-, -ˌflȯr-\Definition of HYDROFLUORIC ACID
: an aqueous solution of hydrogen fluoride HF that is a weak poisonous acid, that resembles hydrochloric acid chemically but attacks silica and silicates, and that is used especially in finishing and etching glass
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