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Medical Definition of Toxicity. Toxicity: The degree to which a substance (a toxin or poison) can harm humans or animals. Acute toxicity involves harmful effects in an organism through a single or short-term exposure. Subchronic toxicity is the ability of a toxic substance to cause effects for more than one year but less than the lifetime of the exposed organism.
toxin. n. 1. (Pathology) any of various poisonous substances produced by microorganisms that stimulate the production of neutralizing substances (antitoxins) in the body. See also endotoxin, exotoxin. 2. (Biology) any other poisonous substance of plant or animal origin.. A poisonous substance, especially a protein, that is produced by living cells or organisms and is capable of causing disease when introduced into the body tissues but is often also capable of inducing neutralizing antibodies or antitoxins. 2. A poisonous or harmful nonbiological substance, such as a pollutant.