SG Heritage Dictionary

Hydrofluoric [Adjective] Webster's Dictionary 1828

Consisting of fluorin and hydrogen. The hydrofluoric acid is obtained by distilling a mixture of one part of the purest fluor spar in fine powder, with two of sulphuric acid.

Hydrofluoric [Adjective] Webster's Dictionary 1913

Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid.