noun. in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter.
1. Noun, singular or mass Boil a few pieces of lettuce for one to two minutes, then place it in the glass jar as food for the infusoria. 2. Noun, plural Because the infusoria move, hey are also very attractive to baby fish. 3. Adjective Start a culture of infusoria several days before your betta fish spawn so they will be ready when your fry hatch.