saxitoxin
saxi·tox·in
noun \ˌsak-sə-ˈtäk-sən\Definition of SAXITOXIN
: a potent nonprotein neurotoxin C10H17N7O4·2HCl that originates in dinoflagellates of the genus Gonyaulax found in red tides and that sometimes occurs in and renders toxic normally edible mollusks which feed on them
