Noun | 1. | permanganate - a dark purple salt of permanganic acid; in water solution it is used as a disinfectant and antiseptic permanganate of potash, potassium permanganate - a poisonous salt that forms dark purple crystals and is purple-red when dissolved in water; used as an oxidizing and bleaching agent and as a disinfectant and antiseptic salt - a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal) |