- Primordial or first-formed animals, or cell-animals; protozoans: a subkingdom of <em>Animalia</em> or prime division of animals, contrasted with <em>Metazoa</em>, or all other animals collectively.
- The lowest of the grand divisions of the animal kingdom.
- Plural form of <xref>protozoan</xref>.
- Plural form of <xref>protozoon</xref>.
- in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers