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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hydrocyanic  \Hy`dro*cy*an"ic\,  a.  [Hydro-,  2  +  anic:  cf  F. 
  hydrocyanique.]  (Chem.) 
  Pertaining  to  or  derived  from  the  combination  of  hydrogen 
  and  cyanogen. 
  {Hydrocyanic  acid}  (Chem.),  a  colorless,  mobile,  volatile 
  liquid,  {HCN},  having  a  characteristic  peach-blossom  odor. 
  It  is  one  of  the  most  deadly  poisons.  It  is  made  by  the 
  action  of  sulphuric  acid  on  yellow  prussiate  of  potassium 
  (potassium  ferrocyanide),  and  chemically  resembles 
  hydrochloric  and  hydrobromic  acids.  Called  also  {prussic 
  acid},  {hydrogen  cyanide},  etc