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(Science: protozoa) genus of protozoa, but also an imprecise name given to several types of free living unicellular phagocytic organism.

giant forms (e.g. Amoeba proteus) may be up to 2mm long and crawl over surfaces by protruding pseudopods (amoeboid movement). Amoebae exhibit great plasticity of form and conspicuous cytoplasmic streaming.