en·​do·​tox·​in | \ ˌen-dō-ˈtäk-sən How to pronounce endotoxin (audio) \

Definition of endotoxin

: a toxic heat-stable lipopolysaccharide substance present in the outer membrane of gram-negative bacteria that is released from the cell upon lysis

Other Words from endotoxin

endotoxic \ ˌen-​dō-​ˈtäk-​sik How to pronounce endotoxin (audio) \ adjective

Examples of endotoxin in a Sentence

Recent Examples on the Web Lipopolysaccharide is a fancy scientific term for an endotoxin that is a major component of the walls of certain bacteria. Patrick Wilson, Outside Online, 15 June 2020 Study subjects injected with the endotoxin were given T-shirts to wear over a few hours to capture their body odor. Sarah Everts, Time, 21 July 2021 When a panel of people smelled the collection T-shirts, panelists found the body odor of people whose immune systems had been activated by the endotoxin to be more aversive than normal body odor. Sarah Everts, Time, 21 July 2021 Because the endotoxin wasn’t actually attached to a pathogen, the study subjects’ immune systems eventually settled down. Sarah Everts, Time, 21 July 2021 The product is refined and sold as endotoxin test kits to pharmaceutical companies. Tim Prudente, baltimoresun.com, 31 Dec. 2020 While other tests exist like synthetic LAL and a human blood test, LAL bacterial endotoxin testing is the gold standard, Hoffmeister said. Doug Fraser, USA TODAY, 16 June 2020 Half were trained in the Method, then they all were injected with an endotoxin that caused fevers, chills, and headaches. Elizabeth Gulino, refinery29.com, 27 Jan. 2020 Scientists like Thurman and those from Lonza use horseshoe crab blood to test for the presence of potentially lethal endotoxins. Maddy Lauria, baltimoresun.com, 22 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'endotoxin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of endotoxin

1904, in the meaning defined above

History and Etymology for endotoxin

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The first known use of endotoxin was in 1904

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Last Updated

26 Jan 2022

Cite this Entry

“Endotoxin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/endotoxin. Accessed 28 Jan. 2022.

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More Definitions for endotoxin


en·​do·​tox·​in | \ ˌen-dō-ˈtäk-sən How to pronounce endotoxin (audio) \

Medical Definition of endotoxin

: a toxin of internal origin specifically : a poisonous substance present in bacteria (as the causative agent of typhoid fever) but separable from the cell body only on its disintegration — compare exotoxin

Other Words from endotoxin

endotoxic \ -​sik How to pronounce endotoxin (audio) \ adjective

More from Merriam-Webster on endotoxin

Britannica.com: Encyclopedia article about endotoxin


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