Bacillus
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.