1. so small as to be visible only with a microscope
2. extremely small; barely perceptible
Usage: often used figuratively
3. relating to or involving the use of a microscope
Usage: technical

Examples

• The bacteria are microscopic and cannot be seen without special equipment.
• Scientists studied the microscopic structure of the cell.
• There was only a microscopic amount of sugar left in the bowl.
• The detective found microscopic fibers on the suspect’s clothing.
• Microscopic examination revealed the cause of the disease.
• The difference in their test scores was microscopic.
• Microscopic organisms live in every drop of pond water.