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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hydrofluoric  \Hy`dro*flu*or"ic\,  a.  [Hydro-,  2  +  fluoric.] 
  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.