potassium oxalate

noun

: any of three crystalline oxalates of potassium:

a

: the normal efflorescent soluble salt K₂C₂O₄.H₂O used chiefly in preventing the clotting of blood (as in blood tests) and formerly in photography

b

: a bitter poisonous acid salt KHC₂O₄.H₂O found especially in oxalis and rhubarb and used chiefly in removing ink stains and scouring metals; potassium hydrogen oxalate

called also potassium acid oxalate, salt of sorrel

c

: potassium tetroxalate

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