protozoan

adj. (Biology) pertaining to the Protozoa (phylum comprised of single-celled organisms)

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).
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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

(n.)
One of the Protozoa.
  

(a.)
Of or pertaining to the Protozoa.
  

protozoan
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