hf

3 definitions found

hf - Collaborative International Dictionary of English v.0.48 :

  Hydrofluoric \Hy`dro*flu*or"ic\, a. [Hydro-, 2 + fluoric.]
     (Chem.)
     Pertaining to, or containing, hydrogen and fluorine;
     fluohydric; as, hydrofluoric acid.
     [1913 Webster]
  
     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.
        [1913 Webster]

hf - WordNet (r) 2.1 (2005) :

  Hf
      n 1: a grey tetravalent metallic element that resembles
           zirconium chemically and is found in zirconium minerals;
           used in filaments for its ready emission of electrons [syn:
           hafnium, Hf, atomic number 72]
      2: 3 to 30 megahertz [syn: high frequency, HF]

hf - V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006) :

  HF
         Have Fun (slang, Usenet, IRC)