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Definition of Bacillus

Bacillus: A large family of bacteria that are rod-like in shape. They include the bacteria that cause food to spoil, as well as those that are responsible for some diseases. Helpful members of the bacillus family are used to make antibiotics or colonize the human intestinal tract and aid with digestion.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/19/2012

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