Clostridium botulinum

bacterium that develops in spoiled food and secretes the botulinum toxin (the toxin causes severe and potentially fatal food poisoning)

Clostridium botulinum is a bacterium that produces the toxin botulin, the causative agent in botulism. It is included in the genus Clostridium, a major group of Gram-positive forms. C. botulinum was first recognized and isolated in 1896 by Emile van Ermengem and is commonly found in soil.These rod-shaped organisms grow best in low-oxygen conditions. They form spores that allow them to survive in a dormant state until exposed to conditions that can support their growth.
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Clostridium bot·u·li·num n. A bacterium that occurs widely in nature and is a cause of botulism; its six main types, A to F, are characterized by [more]Clostridium botulinum - Community and Resources

Noun
1. anaerobic bacterium producing botulin the toxin that causes botulism
(synonym) botulinus, botulinum
(hypernym) eubacteria, eubacterium, true bacteria
(member-holonym) genus Clostridium