Hf : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: Hf	by the DICT Development Group
2 results for Hf
From WordNet (r) 3.0 (2006) [wn]:
Hf n a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons Synonym(s): hafnium, Hf, atomic number 72 3 to 30 megahertz Synonym(s): high frequency, HF
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Hydrofluoric \Hy`drofluor"ic\, a. [Hydro-, 2 + fluoric.] (Chem.) Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid. {Hydrofluoric acid} (Chem.), a colorless, mobile, volatile liquid, {HF}, very corrosive in its action, and having a strong, pungent, suffocating odor. It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.