Medical Definition of amoeba
1 capitalized : a large genus of naked rhizopod protozoans that have lobed and never anastomosing pseudopodia and are widely distributed in fresh and salt water and moist terrestrial environments
2 also ameba plural amoebas or amoebae \-(ˌ)bē\ play : a protozoan of the genus Amoeba; broadly : an amoeboid protozoan (as a naked rhizopod)
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