Any of various flagellated, usually nonpathogenic protozoa of the genus Giardia that may be parasitic in the intestines of vertebrates including human beings and most domestic animals.
type genus of the Chlamydomonadaceae; solitary doubly-flagellated plant-like algae common in fresh water and damp soil; multiply freely; often a pest around filtration plants.
Helicobacter pylori is a Gram-negative flagellated spiral bacteria.
The religious fanatics flagellated themselves.
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