any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle

any member of the subclass Infusoria

any member of the genus Paramecium

relative of the paramecium; often used in genetics research

any of several trumpet-shaped ciliate protozoans that are members of the genus Stentor

any of various protozoa having a transparent goblet-shaped body with a retractile stalk

class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle