Noun | 1. | ciliated protozoan - a protozoan with a microscopic appendage extending from the surface of the cell protozoan, protozoon - any of diverse minute acellular or unicellular organisms usually nonphotosynthetic Ciliata, Ciliophora, class Ciliata, class Ciliophora - class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle infusorian - any member of the subclass Infusoria paramecia, paramecium - any member of the genus Paramecium tetrahymena - relative of the paramecium; often used in genetics research stentor - any of several trumpet-shaped ciliate protozoans that are members of the genus Stentor vorticella - any of various protozoa having a transparent goblet-shaped body with a retractile stalk |