Noun | 1. | genus Vorticella - ciliated protozoans that have a goblet-shaped body with a retractile stalk protoctist genus - any genus of Protoctista 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 vorticella - any of various protozoa having a transparent goblet-shaped body with a retractile stalk |