Definition of bacillus:

part of speech: noun

An elongated rodlike bacterium; a single- celled fungus.

part of speech: noun

A species of rod- like microscopic organisms belonging to the genus Bacterium. Certain diseases are believed to be caused by these bodies being introduced into the system.

part of speech: noun

Any of a genus, or kind, of rodshaped vegetable organisms, visible only under the microscope.

Usage examples for bacillus:

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