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[ek-soj-uh-nuh s] /ɛkˈsɒdʒ ə nəs/
originating from outside; derived externally.
  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.
Pathology. (of a disease) externally caused rather than resulting from conditions within the organism.
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.
Geology, exogenetic (def 1).
Also, exogenetic (for defs 2–4).
Origin of exogenous
1820-30; exo- + -gen + -ous
Related forms
exogenism, noun
exogenously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for exogenous
  • So endogenous retroviral elements have provided a defense mechanism against exogenous retroviruses.
  • Some of it is exogenous to the collective decisions of firms, some of it is endogenous.
  • We know that exogenous chemicals mimic neurotransmitters and modulators.
  • Rather, it was an exogenous result of mistakes made by bankers in other countries.
  • Apart from the difficulty of forecasting the impact of exogenous events, investors may have another reason for ignoring them.
  • Evolution is a gradual process sometimes punctuated by exogenous catastrophes.
  • Policy is not an exogenous or all-determining variable.
  • We then examine the behavior of output following these more exogenous legislated changes.
  • Past research has shown that exogenous shocks, such as recessions, can modify firm-level behaviour.
  • There have been other, exogenous, factors pushing up grain prices.
British Dictionary definitions for exogenous


having an external origin
  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
(psychiatry) (of a mental illness) caused by external factors
Derived Forms
exogenously, 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
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Word Origin and History for exogenous

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

Online Etymology Dictionary, © 2010 Douglas Harper
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exogenous in Medicine

exogenous ex·og·e·nous (ěk-sŏj'ə-nəs)

  1. Originating or produced outside of an organism, a tissue, or a cell.

  2. Having a cause external to the body. Used of diseases.

ex·og'e·nous·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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exogenous in Science
Originating or produced from outside an organism, tissue, or cell. Compare endogenous.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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