- a major grouping or superphylum of the kingdom Protista, comprising the protozoans.
Origin of Protozoa
- any of a diverse group of eukaryotes, of the kingdom Protista, that are primarily unicellular, existing singly or aggregating into colonies, are usually nonphotosynthetic, and are often classified further into phyla according to their capacity for and means of motility, as by pseudopods, flagella, or cilia.
- of, relating to, or characteristic of a protozoan.
Origin of protozoan
Origin of protozoon
Examples from the Web for protozoa
The Protozoa, or one-celled animals (nearly all microscopic).
The mode of feeding of the sponge is very similar to that of the protozoa.The Sea Shore
William S. Furneaux
The first grade includes only the Protozoa, or unicellular animals.
The animals which are higher in structure than the Protozoa, viz.
Two things must be noticed before we leave the subject of the Protozoa.
- Also called: protozoon (ˌprəʊtəˈzəʊɒn) plural -zoa any of various minute unicellular organisms formerly regarded as invertebrates of the phylum Protozoa but now usually classified in certain phyla of protoctists. Protozoans include flagellates, ciliates, sporozoans, amoebas, and foraminifers
- of or relating to protozoans
Word Origin and History for protozoa
1828, from Modern Latin Protozoa, coined 1818 by German zoologist Georg August Goldfuss (1782-1848) from Greek protos "first" (see proto-) + zoia, plural of zoion "animal" (see zoo). Originally including sponges and corals; current sense is from 1845. Related: Protozoon (aingular); Protozoan.
- Plural ofprotozoan
- Any of a group of single-celled, usually microscopic, eukaryotic organisms, such as amoebas, ciliates, flagellates, and sporozoans.
- Any of a large group of one-celled organisms (called protists) that live in water or as parasites. Many protozoans move about by means of appendages known as cilia or flagella. Protozoans include the amoebas, flagellates, foraminiferans, and ciliates. Their traditional classification as the subkingdom Protozoa is still used for convenience, but it is now known that protozoans represent several evolutionarily distinct groups. See more at protist.