}} Amoeba (sometimes amœba or ameba, plural amoebae) is a genus of protozoa that moves by means of pseudopods, and is well-known as a representative unicellular organism. The word amoeba or ameba is variously used to refer to it and its close relatives, now grouped as the Amoebozoa, or to all protozoa that move using pseudopods, otherwise termed amoeboids. History The amoeba was first discovered by August Johann Rösel von Rosenhof in 1755. Early naturalists referred to Amoeba as t… (More on Amoeba)