HF

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [wn]:

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

From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:

  HF
       Have Fun (telecommunication-slang, Usenet, IRC)