[ 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.


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Also exogenetic (for defs 2–4).

Origin of exogenous

First recorded in 1820–30; exo- + -gen + -ous


ex·og·e·nism, nounex·og·e·nous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for exogenous

British Dictionary definitions for exogenous

/ (ɛkˈsɒdʒɪnəs) /


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 of exogenous

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

Medical definitions for exogenous

[ ĕk-sŏjə-nəs ]


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

Other words from exogenous

ex•oge•nous•ly adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for exogenous

[ ĕk-sŏjə-nəs ]

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.