¦sēgwə¦täksə̇n, ¦sig- noun
Etymology: cigua tera + toxin
: a potent heat-stable lipid neurotoxin that is produced by a marine dinoflagellate ( Gambierdiscuss 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