- any of numerous protozoa of the widespread subphylum (or superclass) Rhizopoda, characterized by a pseudopod and comprising most members of the phylum Sarcodina, including the amebas and foraminifers.
- any protozoan of the phylum Rhizopoda, characterized by naked protoplasmic processes (pseudopodia). The group includes the amoebas
- of, relating to, or belonging to the Rhizopoda
- Any of various protozoans of the group Rhizopoda, characteristically moving and taking in food by means of pseudopods. Rhizopods include amoebas and radiolarians.