Prussian red noun 2adjective 1forms 3 noun2 •Potassium ferricyanide, K₃[Fe(CN)₆], a highly poisonous ferric crystal salt of potassium cyanide used as a pigment. •The colour of this compound: a hue of semi-dark brownish red adjective1 •Of a brownish hue of red colour. formsPrussian reds · more Prussian red · most Prussian red
