noun Pharmacology.
a neurotoxin, C 11 H 17 N 3 O 3 , occurring in a species of puffer fish: ingestion of the toxin is usually rapidly fatal due to heart failure or asphyxiation; used experimentally to block impulse conduction potential in excitable cells.

1910–15; < Neo-Latin Tetrodo(n) genus name of the puffer fish (see tetr-, -odont) + toxin

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World English Dictionary
tetrodotoxin (ˌtɛtrəʊdəʊˈtɒksɪn)
a highly lethal neurotoxin found in certain puffer fish and in newts of the genus Taricha. Formula: C11H17N3O3
[C20: from New Latin Tetrodon (puffer fish genus name, from Greek tetra- fourfold + odont- tooth) + toxin]

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American Heritage
Medical Dictionary

tetrodotoxin te·tro·do·tox·in (tě-trō'də-tŏk'sĭn)
A potent neurotoxin, found in many puffer fish and certain newts.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Some species tolerate high levels of tetrodotoxin, and answers may lie in the evolution of sodium ion channels.
But because the liver and other internal organs of the fish contain tetrodotoxin, fugu can be deadly if not prepared correctly.
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