Noun
A provisional group in which are placed a number of low microscopic organisms of doubtful nature. Some are probably plants, others animals.
of Protiston
Source: Webster's dictionaryHaeckel revised the content of this kingdom a number of times before settling on a division based on whether organisms were unicellular (Protista) or multicellular (animals and plants). Source: Internet
In modern formal classifications, the term is considered obsolete; the microorganisms previously included in the Infusoria are mostly assigned to the kingdom Protista which itself is a polyphyletic assemblage of groups. Source: Internet
The remaining two kingdoms, Protista and Monera, included unicellular and simple cellular colonies. citation The five kingdom system may be combined with the two empire system: In the Whittaker system, Plantae included some algae. Source: Internet
In 2004, a review article by Simpson and Roger noted that the Protista were "a grab-bag for all eukaryotes that are not animals, plants or fungi". Source: Internet