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|Noun||1.||genus Tetrahymena - protozoa having four membranous ciliary organelles|
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
tetrahymena - relative of the paramecium; often used in genetics research