usually nonphotosynthetic free-living protozoan with whiplike appendages; some pathogens of humans and other animals

whip; "The religious fanatics flagellated themselves"

Type of algae.

a protozoan that has flagella, or long, hairlike structures that whip and lash to help it swim

Flagellates are cells with one or more whip-like organelles called flagella. Some cells in animals may be flagellate, for instance the sperm cells of most phyla. Higher plants and fungi do not produce flagellate cells, but the closely related green algae and chytrids do.