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Use "toxical" in a sentence
"Pay attention to the instructions of the manufacturer - often toxical or injurious to health."
"To be coated with copper sulphate solution (CuSO4) - danger - toxical!"
"From this point the President proceeded to speak of the increased toxical power of volatile compounds given off by neglected decomposed matter, and was thence led to dwell upon the dangers arising from decomposed substances in cesspools and in badly constructed drains."