spindle-shaped bacterial cell esp. one swollen at the center by an endospore.

a genus of anaerobic, spore-forming motile bacteria of the family Bacillaceae, including several pathogenic species, such as the causative agents of gas gangrene (Clostridium perfringens), botulism (Clostridium botulinum), and tetanus (Clostridium tetani).

A genus of bacteria that includes the agents capable of causing food poisoning and tetanus.

an anaerobic spore-forming bacterium.