• synonyms


[ek-soj-uh-nuh s]
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  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).
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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. 2018

Related Words for exogenous

external, extrinsic, foreign, alien, estranged, remote, strange, unfamiliar, exotic

Examples from the Web for exogenous

Contemporary Examples of exogenous

Historical Examples of exogenous

British Dictionary definitions for exogenous


  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
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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 exogenous


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

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Online Etymology Dictionary, © 2010 Douglas Harper

exogenous in Medicine


  1. Originating or produced outside of an organism, tissue, or cell.
  2. Having a cause external to the body. Used of diseases.
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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.

exogenous in Science


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