protozoans

n. any eukaryotic organism (usually single-celled) from the kingdom Protista

Protozoa (in Greek proto = first and zoa = animals) are one-celled eukaryotes (that is, unicellular microbes whose cells have membrane-bound nuclei) that commonly show characteristics usually associated with animals,  mobility and heterotrophy. Protozoans were commonly grouped in the kingdom Protista together with the plant-like algae and fungus-like water molds and slime molds. In 21st-century systematics, however, most of the algae are classified in kingdoms such as Plantae and Chromista; and in such cases the remaining life forms are occasionally classified as a kingdom Protozoa. But the name is misleading, since protozoans are neither Animalia nor Metazoa, with the possible exception of the enigmatic, moldy Myxozoa).
See more at Wikipedia.org...

Noun
1. any of diverse minute acellular or unicellular organisms usually nonphotosynthetic
(synonym) protozoon
(hypernym) protoctist
(hyponym) sarcodinian, sarcodine
(member-holonym) Protozoa, phylum Protozoa
(part-meronym) cytostome
Adjective
1. of or relating to the Protozoa
(synonym) protozoal, protozoic
(pertainym) Protozoa, phylum Protozoa

PROTOZOI