Saxitoxin

noun Etymology: saxi- (from New Latin Saxidomus giganteus, species of butter clam from which it is isolated) + toxin a potent nonprotein neurotoxin C10H17N7O4•2HCl that originates especially in dinoflagellates (genus Gonyaulax) found in red tides and that sometimes occurs in and renders toxic normally edible mollusks which feed on them

Энциклопедический словарь Мерриама-Вебстера