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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
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