You searched for: “infusorium
infusorium (s) (noun), infusoria (pl)
1. Any of various microscopic organisms found in infusions of decaying organic matter.
2. One of the classes of Protozoa, including a large number of species, all of minute size.

They are found in all seas, lakes, ponds, and streams; as well as, in infusions of organic matter exposed to the air.

This entry is located in the following unit: fus-, fun-, fund-, fut-, found- (page 6)