noun Biochemistry.

a soluble toxin excreted by a microorganism.

Compare endotoxin.

Origin of exotoxin

First recorded in 1915–20; exo- + toxin
Related formsex·o·tox·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for exotoxic



a toxin produced by a microorganism and secreted into the surrounding medium
Derived Formsexotoxic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for exotoxic




Relating to an exotoxin.
Relating to the introduction of an exogenous poison or toxin.




A toxin secreted by a microorganism and released into the environment in which it grows.extracellular toxin
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.