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