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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.
endotoxin - a toxin that is confined inside the microorganisms and is released only when the microorganisms are broken down or die. toxin - a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species. exotoxin - a toxin that is secreted by microorganisms into the surrounding medium.