ciguatoxin
noun
ci·gua·tox·in
| \ ˈsē-gwə-ˌtäk-sən
, ˈsig-wə-
\
, ˈsig-wə-
\
Medical Definition of ciguatoxin
: a potent heat-stable neurotoxin that is produced by a marine dinoflagellate (Gambierdiscus toxicus) and causes ciguatera poisoning in those who eat fish (as barracuda or amberjack) in which toxic levels of it have become concentrated
also
: any of several related neurotoxins causing ciguatera