1. a microscopic single-celled organism, especially a ciliated protozoan found in infusions of organic matter
Usage: biology; archaic

1. relating to or characteristic of infusorians
Usage: biology; archaic

Examples

• The scientist observed various infusorians swimming in the pond water sample.
• Under the microscope, the infusorian displayed rapid ciliary movement.
• The biology textbook described infusorians as common freshwater microorganisms.
• Paramecium is a well-known example of an infusorian.
• The infusorian population thrived in the nutrient-rich culture medium.
• Early microbiologists classified many protozoans as infusorians.