a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species

a bacterial toxin produced by clostridium perfringens; causes intense abdominal cramps and diarrhea that begins 8-22 hours after consumption of foods containing large numbers of these bacteria

a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin

potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon

any of a group of toxins produced by cyanobacteria.