Definition of "infusorium" []

• An individual of the infusoria (noun)

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• "Further, we find in those subterraneous waters a species of the sun infusorium (_Actinophrys_), which is especially frequent in the mines of Klausthal."
• "Up to that time the chief aim in the classification of the animal kingdom was to arrange all the animals from lowest to highest, from the infusorium to man, in one long and continuous series."
• "Every animal that has only one cell-nucleus, every amoeba, every gregarina, every infusorium, is unicellular, and remains unicellular whatever variety of matter it feeds on."