Wordnet 3.0
NOUN (1)
1. 
 a dark purple salt of permanganic acid; 
 in water solution it is used as a disinfectant and antiseptic; 
The Collaborative International Dictionary of English v.0.48:
Permanganate \Per*man"ga*nate\, n. (Chem.)
   A salt of permanganic acid.
   [1913 Webster]
   Potassium permanganate. (Chem.) See Potassium
      permanganate, under Potassium.
      [1913 Webster]
WordNet (r) 3.0 (2006):
permanganate
    n 1: a dark purple salt of permanganic acid; in water solution
         it is used as a disinfectant and antiseptic