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1. The branch of biology that deals with microorganisms, especially their effects on man and other living organisms. (

2. Refers to the study of microscopic organisms, which are defined as any living organism that is either a single cell (unicellular), a cell cluster, or has no cells at all (acellular). Microbiology is a broad term which includes virology, mycology, parasitology, bacteriology, immunology and other branches. (

3. The study of organisms that are too small to be seen with the naked eye, such as bacteria, viruses and yeasts. (


Word origin: From Greek μῑκρος, mīkros, “small”; βίος, bios, “life”; and -λογία, -logia

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