1. a single-celled microscopic organism, especially one that can move and feed like an animal
Usage: biology; often used in scientific contexts

Examples

• The amoeba is a common type of protozoon found in pond water.
• Scientists studied the protozoon under a powerful microscope.
• This protozoon reproduces by dividing into two identical cells.
• The paramecium is a well-known protozoon used in biology classes.
• Many diseases are caused by parasitic protozoa.
• The protozoon moved through the water using tiny hair-like structures.