[ek-soj-uh-nuh s]
  1. originating from outside; derived externally.
  2. Botany.
    1. (of plants, as the dicotyledons) having stems that grow by the addition of an annual layer of wood to the outside beneath the bark.
    2. pertaining to plants having such stems.
    3. belonging to the exogens.
  3. Pathology. (of a disease) externally caused rather than resulting from conditions within the organism.
  4. Biochemistry. of or noting the metabolic assimilation of proteins or other metabolites, the elimination of nitrogenous catabolites being in direct proportion to the amount of metabolites taken in.
  5. Geology. exogenetic(def 1).
Also exogenetic (for defs 2–4).

Origin of exogenous

First recorded in 1820–30; exo- + -gen + -ous
Related formsex·og·e·nism, nounex·og·e·nous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for exogenously

Contemporary Examples of exogenously

  • Exogenously higher income"—that is, wealth that comes, poof, out of the blue—"produces unhealthy living.

    The Daily Beast logo
    Lotto Death Curse

    Anneli Rufus

    February 19, 2010

British Dictionary definitions for exogenously


  1. having an external origin
  2. biology
    1. developing or originating outside an organism or part of an organism
    2. of or relating to external factors, such as light, that influence an organism
  3. psychiatry (of a mental illness) caused by external factors
Derived Formsexogenously, adverb
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

Word Origin and History for exogenously



1830, from Modern Latin exogenus (on model of indigenus); see exo- + -genous.

Online Etymology Dictionary, © 2010 Douglas Harper

exogenously in Medicine


  1. Originating or produced outside of an organism, tissue, or cell.
  2. Having a cause external to the body. Used of diseases.
Related formsex•oge•nous•ly adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

exogenously in Science


  1. Originating or produced from outside an organism, tissue, or cell. Compare endogenous.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.