Etymology:
The word "bacillus" comes from the Latin word "bacillum," which means "small staff or rod."
Meaning:
In microbiology, a bacillus is a rod-shaped bacterium. Bacilli are typically single-celled, non-motile, and Gram-positive. They can be aerobic or anaerobic, and they can be found in a wide range of habitats, including soil, water, and the human body.
Origin:
The term "bacillus" was first used in the 19th century by German bacteriologist Ferdinand Cohn. Cohn classified bacteria into different groups based on their shape, and he placed the rod-shaped bacteria in the genus Bacillus. The type species of the genus Bacillus is Bacillus subtilis, a bacterium that is commonly found in soil and is used in the production of antibiotics.
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