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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.
Description of Exotoxin. Exotoxin: toxic substances produced by certain bacteria, that are found outside the bacterial cell or free in the culture medium; they are heat labile proteins and are among the most poisonous substances known; some fungi also produce exotoxins.