Definition of "infusoria" [‖In•fu•so•ri•a]

• The many minute aquatic creatures, such as protozoa and unicellular algae found in fresh water habitats (noun)

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• "The microscope revealed the complexity of organic tissues, the existence of minute creatures, vaguely called infusoria, and the strange inhabitants of the blood, the red and white corpuscles."
• "There are certain minute animal productions called infusoria and organisms peculiar to each portion of the globe."
• "In 1838, Christian Gottfried Ehrenberg gave a description of the finer structure of the "infusoria" but it was Ferdinad Cohn, who in 1854 first ascertained with certainty that bacteria belonged to the vegetable kingdom."