1. Ameba definition is - any of a large genus (Amoeba) of naked rhizopod protozoans with lobed and never anastomosing pseudopodia, without permanent organelles or supporting structures, and of wide distribution in fresh and salt water and moist terrestrial environments; broadly : a naked rhizopod or other amoeboid protozoan.

2. Ameba - naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion amoeba rhizopod , rhizopodan - protozoa characterized by a pseudopod

3. 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

4. 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

5. 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

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