The examination or observation of bacteria under a microscope; the technique of using microscopy to study bacterial cells.
From 'bacterio-' (bacteria) + '-scopy' (from Greek 'skopein,' meaning to look at or examine), a technical term from the 19th century describing the actual procedure of viewing bacteria microscopically.
Bacterioscopy was one of the most important tools ever invented for human progress—by letting scientists actually see bacteria, it made disease's true cause visible and launched the age of modern medicine.
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