exogenous

adjective

ex·​og·​e·​nous ek-ˈsä-jə-nəs How to pronounce exogenous (audio)
1
: produced by growth from superficial tissue
exogenous roots produced by leaves
2
a
: caused by factors (such as food or a traumatic factor) or an agent (such as a disease-producing organism) from outside the organism or system
exogenous obesity
exogenous psychic depression
exogenous market fluctuations
b
: introduced from or produced outside the organism or system
specifically : not synthesized within the organism or system
exogenously adverb

Examples of exogenous in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Berryhill added that humans constantly juggle two competing forms of attention—endogenous, or top-down focus, and exogenous, or bottom-up distraction. Melissa Fleur Afshar, MSNBC Newsweek, 11 Sep. 2025 This is welcome news for a system plagued by various exogenous shocks — including COVID and related frothy valuations, high interest rates and the 2022 market correction, the US electoral cycle, and tariff uncertainty — that have resulted in wide bid-ask spreads repressing deal activity. Control Risks, Forbes.com, 10 Sep. 2025 Opioids, whether endogenous or those found in narcotics (called exogenous opioids), bind to opioid receptors located on the outer membrane of nerve cells in the brain, spinal cord, and other organs. Dr. Sanjay Gupta, CNN Money, 26 Aug. 2025 Any exogenous shock such as a trade war or a real war may be both a contributing cause and proximate trigger for a crisis. Edward Lotterman, Twin Cities, 15 June 2025 See All Example Sentences for exogenous

Word History

Etymology

French exogène exogenous, from exo- + -gène (from Greek -genēs born) — more at -gen

First Known Use

1830, in the meaning defined at sense 1

Time Traveler
The first known use of exogenous was in 1830

Browse Nearby Words

Cite this Entry

“Exogenous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exogenous. Accessed 17 Sep. 2025.

Medical Definition

exogenous

adjective
ex·​og·​e·​nous ek-ˈsäj-ə-nəs How to pronounce exogenous (audio)
variants also exogenic
1
: growing from or on the outside
exogenous spores
2
: caused by factors (as food or a traumatic event) or an agent (as a disease-producing organism) from outside the organism or system
exogenous obesity
exogenous depression
3
: introduced from or produced outside the organism or system
specifically : not synthesized within the organism or system compare endogenous
exogenously adverb
Last Updated: - Updated example sentences
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