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exotoxin exÂ·oÂ·toxÂ·in (Äk'sÅ-tÅk'sÄ­n) n. A toxin secreted by a microorganism and released into the environment in which it grows. Also called extracellular toxin.
enterotoxin. 1. a toxin specific for the cells of the intestinal mucosa. 2. a toxin arising in the intestine. 3. an exotoxin that is protein in nature and relatively heat-stable, produced by staphylococci.ost enterotoxins are produced by certain species of bacteria, such as Staphylococcus. Infectious disease A toxin with a direct effect on the intestinal mucosa, eliciting net fluid secretion; the 'classic' enterotoxin is cholera toxin, which evokes intestinal fluid secretion, by activating adenylate cyclase.