rainbow cactus: a stout cylindrical cactus of the southwest United States and adjacent Mexico
cactus: any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines
minamata disease: a form of mercury poisoning among people who ate fish from mercury-contaminated waters of Minamata Bay off Japan in the 1950s; characterized by severe neurological degeneration