from the GNU version of the Collaborative International Dictionary of English
- n.pl. An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Amœbea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See protozoa.
from The Century Dictionary and Cyclopedia
- In Dujardin's system of classification (1841), the third family of “diversiform infusorians without visible locomotory appendages”—that is, without permanent appendages, as cilia or flagella.
- The lowest class of Protozoa, composed of simple or multiple animalcules without definite or permanent distinction of external parts, and provided with diversiform temporary or permanent pseudopodial prolongations of the bodysubstance, by means of which locomotion, fixation, and ingestion are effected.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. creeping protozoans: amoebas and foraminifers
Sorry, no etymologies found.
Rhizopoda means "root-footed," and the name is applied to these animals because most of them move about by means of root-like processes known as pseudopodia or "false feet."
The amoeba belongs to the lowest of these, the Rhizopoda.