| n. pl. | 1. | (Zool.) One of the classes of Protozoa, including a large number of species, all of minute size. Formerly, the term was applied to any microbe found in infusions of decaying organic material, but the term is now applied more specifically to one of the classes of the phylum |
| Noun | 1. | Infusoria - in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter Synonyms: subclass Infusoria |
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