<pharmacology> A poison, frequently used to refer specifically to a protein produced by some higher plants, certain animals and pathogenic bacteria, which is highly toxic for other living organisms.

Such substances are differentiated from the simple chemical poisons and the vegetable alkaloids by their high molecular weight and antigenicity.

Origin: Gr toxikon = arrow poison, from Gr. Toxikos = of or for a bow

(11 Mar 2008)

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